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735 | <h1><span style='mso-bidi-font-family:"Times New Roman"'>Determining Profile |
---|
736 | Parameters from a Standard<o:p></o:p></span></h1> |
---|
737 | |
---|
738 | <p class=MsoNormal><o:p> </o:p></p> |
---|
739 | |
---|
740 | <p class=MsoNormal><BL> |
---|
741 | <LI>A video version of the first two parts of this tutorial is |
---|
742 | available at <a |
---|
743 | href="https://anl.box.com/v/FindProfParamCW"><b>https://anl.box.com/v/FindProfParamCW</b></a> |
---|
744 | <LI>Exercise files are found <A href="./data/" target="_blank">here</a> |
---|
745 | </BL></P><P></P> |
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746 | |
---|
747 | |
---|
748 | <p class=MsoNormal><span style='font-size:14.0pt'><o:p> </o:p></span></p> |
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749 | |
---|
750 | <p class=MsoNormal><span style='font-size:14.0pt'>The goal of this exercise is |
---|
751 | to determine approximate instrument profile parameters by a quick peak fit to a |
---|
752 | sample with a lab diffractometer. Ideally, one should use a material or mixture |
---|
753 | of materials that has peaks over the entire range where you collect data and |
---|
754 | use a material(s) that have negligible sample broadening (from crystallite size |
---|
755 | or <span class=SpellE>microstrain</span>). The NIST LaB<sub>6</sub> standards |
---|
756 | (SRM 660, 660a and 660b) are good choices for this, as it has very little |
---|
757 | sample broadening and a relatively small number of peaks over a wide angular |
---|
758 | range, although it would be good to have peaks starting somewhat lower in |
---|
759 | 2theta. <o:p></o:p></span></p> |
---|
760 | |
---|
761 | <p class=MsoNormal><span style='font-size:14.0pt'><o:p> </o:p></span></p> |
---|
762 | |
---|
763 | <p class=MsoNormal><b style='mso-bidi-font-weight:normal'><span |
---|
764 | style='font-size:14.0pt'>Note</span></b><span style='font-size:14.0pt'> that it |
---|
765 | is highly recommended to collect reference data to a much higher 2theta angle |
---|
766 | than here. What is done in this part serves as an example, and is sufficient |
---|
767 | only if one will never collect and use data above 70 degrees (unlikely!). <o:p></o:p></span></p> |
---|
768 | |
---|
769 | <p class=MsoNormal><span style='font-size:14.0pt'><o:p> </o:p></span></p> |
---|
770 | |
---|
771 | <p class=MsoNormal><span style='font-size:14.0pt'>To get started, create a new |
---|
772 | project in GSAS-II, either by starting the program fresh or using <b |
---|
773 | style='mso-bidi-font-weight:normal'>File/New Project</b>. <o:p></o:p></span></p> |
---|
774 | |
---|
775 | <p class=MsoNormal><span style='font-size:14.0pt'><o:p> </o:p></span></p> |
---|
776 | |
---|
777 | <p class=MsoNormal><span class=Heading3Char><span style='font-size:14.0pt'>Step |
---|
778 | 1: Read in the Diffraction Data</span></span><span style='font-size:14.0pt'><o:p></o:p></span></p> |
---|
779 | |
---|
780 | <p class=MsoNormal><span style='font-size:14.0pt'><o:p> </o:p></span></p> |
---|
781 | |
---|
782 | <p class=MsoNormal style='mso-pagination:none;tab-stops:28.0pt 56.0pt 84.0pt 112.0pt 140.0pt 168.0pt 196.0pt 224.0pt 3.5in 280.0pt 308.0pt 336.0pt; |
---|
783 | mso-layout-grid-align:none;text-autospace:none'><span style='font-size:14.0pt'>Use |
---|
784 | <b style='mso-bidi-font-weight:normal'>Import/Powder Data/from <span |
---|
785 | class=SpellE>Bruker</span> RAW file</b> to read </span><span style='font-size: |
---|
786 | 14.0pt;font-family:Courier'>file </span><span style='font-size:14.0pt; |
---|
787 | font-family:Courier;mso-bidi-font-family:"Menlo Regular";color:black; |
---|
788 | mso-fareast-language:EN-US'>LaB6_Jan2018.raw</span><span style='font-size:14.0pt; |
---|
789 | font-family:"Menlo Regular";color:black;mso-fareast-language:EN-US'> </span><span |
---|
790 | style='font-size:14.0pt'>from the Tutorials <span class=SpellE>CWInstDemo</span>/data |
---|
791 | directory (download from <a |
---|
792 | href="https://subversion.xray.aps.anl.gov/pyGSAS/Tutorials/CWInstDemo/data/">https://subversion.xray.aps.anl.gov/pyGSAS/Tutorials/CWInstDemo/data/</a>). |
---|
793 | After selecting this file, answer yes to "Is this the file you want?"<o:p></o:p></span></p> |
---|
794 | |
---|
795 | <p class=MsoNormal><span style='font-size:14.0pt'><o:p> </o:p></span></p> |
---|
796 | |
---|
797 | <h3><span style='font-size:14.0pt;mso-bidi-font-family:"Times New Roman"'>Step |
---|
798 | 2: Select Default Instrument Parameters<o:p></o:p></span></h3> |
---|
799 | |
---|
800 | <p class=MsoNormal><span style='font-size:14.0pt'><o:p> </o:p></span></p> |
---|
801 | |
---|
802 | <p class=MsoNormal><span style='font-size:14.0pt'>The next dialog to appear is |
---|
803 | titled, "Choose inst. <span class=SpellE>Param</span> file for |
---|
804 | LaB6_Jan2018.raw Scan 1 (or Cancel for default)" since we do not have a |
---|
805 | set of parameters to read, we must use a default set. <b style='mso-bidi-font-weight: |
---|
806 | normal'>Press Cancel</b>.<o:p></o:p></span></p> |
---|
807 | |
---|
808 | <p class=MsoNormal><span style='font-size:14.0pt'><o:p> </o:p></span></p> |
---|
809 | |
---|
810 | <p class=MsoNormal><span style='font-size:14.0pt'>This raises the default <span |
---|
811 | class=SpellE>inst</span> <span class=SpellE>parms</span> dialog, as below<o:p></o:p></span></p> |
---|
812 | |
---|
813 | <p class=MsoNormal><span style='font-size:14.0pt;mso-fareast-language:EN-US; |
---|
814 | mso-no-proof:yes'><!--[if gte vml 1]><v:shapetype id="_x0000_t75" coordsize="21600,21600" |
---|
815 | o:spt="75" o:preferrelative="t" path="m@4@5l@4@11@9@11@9@5xe" filled="f" |
---|
816 | stroked="f"> |
---|
817 | <v:stroke joinstyle="miter"/> |
---|
818 | <v:formulas> |
---|
819 | <v:f eqn="if lineDrawn pixelLineWidth 0"/> |
---|
820 | <v:f eqn="sum @0 1 0"/> |
---|
821 | <v:f eqn="sum 0 0 @1"/> |
---|
822 | <v:f eqn="prod @2 1 2"/> |
---|
823 | <v:f eqn="prod @3 21600 pixelWidth"/> |
---|
824 | <v:f eqn="prod @3 21600 pixelHeight"/> |
---|
825 | <v:f eqn="sum @0 0 1"/> |
---|
826 | <v:f eqn="prod @6 1 2"/> |
---|
827 | <v:f eqn="prod @7 21600 pixelWidth"/> |
---|
828 | <v:f eqn="sum @8 21600 0"/> |
---|
829 | <v:f eqn="prod @7 21600 pixelHeight"/> |
---|
830 | <v:f eqn="sum @10 21600 0"/> |
---|
831 | </v:formulas> |
---|
832 | <v:path o:extrusionok="f" gradientshapeok="t" o:connecttype="rect"/> |
---|
833 | <o:lock v:ext="edit" aspectratio="t"/> |
---|
834 | </v:shapetype><v:shape id="Picture_x0020_1" o:spid="_x0000_i1025" type="#_x0000_t75" |
---|
835 | style='width:390pt;height:207pt;visibility:visible'> |
---|
836 | <v:imagedata src="FindProfParamCW_files/image001.png" o:title=""/> |
---|
837 | </v:shape><![endif]--><![if !vml]><img border=0 width=392 height=209 |
---|
838 | src="FindProfParamCW_files/image002.png" v:shapes="Picture_x0020_1"><![endif]></span><span |
---|
839 | style='font-size:14.0pt'><o:p></o:p></span></p> |
---|
840 | |
---|
841 | <p class=MsoNormal><span style='font-size:14.0pt'>Here, <b style='mso-bidi-font-weight: |
---|
842 | normal'>choose the first option</b> for <span class=SpellE>CuKa</span> lab data |
---|
843 | (which is for a standard instrument with Kalpha1 and Kalpha2 radiation) and <b |
---|
844 | style='mso-bidi-font-weight:normal'>press OK</b>. A plot of the data will |
---|
845 | appear as below.<o:p></o:p></span></p> |
---|
846 | |
---|
847 | <p class=MsoNormal><span style='font-size:14.0pt'><span |
---|
848 | style="mso-spacerun:yes"> </span></span><span style='font-size:14.0pt; |
---|
849 | mso-fareast-language:EN-US;mso-no-proof:yes'><!--[if gte vml 1]><v:shape id="Picture_x0020_2" |
---|
850 | o:spid="_x0000_i1026" type="#_x0000_t75" style='width:310pt;height:229pt; |
---|
851 | visibility:visible'> |
---|
852 | <v:imagedata src="FindProfParamCW_files/image003.png" o:title=""/> |
---|
853 | </v:shape><![endif]--><![if !vml]><img border=0 width=312 height=231 |
---|
854 | src="FindProfParamCW_files/image004.png" v:shapes="Picture_x0020_2"><![endif]></span><span |
---|
855 | style='font-size:14.0pt'><o:p></o:p></span></p> |
---|
856 | |
---|
857 | <p class=MsoNormal><span style='font-size:14.0pt'><o:p> </o:p></span></p> |
---|
858 | |
---|
859 | <p class=MsoNormal><span class=Heading3Char><span style='font-size:14.0pt'>Step |
---|
860 | 3: Change Data Range</span></span><span style='font-size:14.0pt'>. <o:p></o:p></span></p> |
---|
861 | |
---|
862 | <p class=MsoNormal><span style='font-size:14.0pt'><o:p> </o:p></span></p> |
---|
863 | |
---|
864 | <p class=MsoNormal><span style='font-size:14.0pt'>Note that the data begins at |
---|
865 | 10 degrees, but the first peak is above 21 degrees, we can simplify the |
---|
866 | background fitting by changing the data limits. <b style='mso-bidi-font-weight: |
---|
867 | normal'>Click on the Limits</b> data tree item, and either change the <span |
---|
868 | class=SpellE>Tmin</span> value from 10 to 20 or in the plot <b |
---|
869 | style='mso-bidi-font-weight:normal'>"drag" the green line to the |
---|
870 | right</b> to approximately 20 degrees. <o:p></o:p></span></p> |
---|
871 | |
---|
872 | <p class=MsoNormal><span style='font-size:14.0pt;mso-fareast-language:EN-US; |
---|
873 | mso-no-proof:yes'><!--[if gte vml 1]><v:shape id="Picture_x0020_3" o:spid="_x0000_i1027" |
---|
874 | type="#_x0000_t75" style='width:310pt;height:222pt;visibility:visible'> |
---|
875 | <v:imagedata src="FindProfParamCW_files/image005.png" o:title=""/> |
---|
876 | </v:shape><![endif]--><![if !vml]><img border=0 width=312 height=224 |
---|
877 | src="FindProfParamCW_files/image006.png" v:shapes="Picture_x0020_3"><![endif]></span><span |
---|
878 | style='font-size:14.0pt'><o:p></o:p></span></p> |
---|
879 | |
---|
880 | <p class=MsoNormal><span style='font-size:14.0pt'><o:p> </o:p></span></p> |
---|
881 | |
---|
882 | <h3><span style='font-size:14.0pt;mso-bidi-font-family:"Times New Roman"'>Step |
---|
883 | 4: Add Peaks to Fit<o:p></o:p></span></h3> |
---|
884 | |
---|
885 | <p class=MsoNormal><span style='font-size:14.0pt'><o:p> </o:p></span></p> |
---|
886 | |
---|
887 | <p class=MsoNormal><span style='font-size:14.0pt'>To define peaks, <b |
---|
888 | style='mso-bidi-font-weight:normal'>click on the "Peak List</b>" data |
---|
889 | tree item. Note that as below, the peak list is initially empty. <o:p></o:p></span></p> |
---|
890 | |
---|
891 | <p class=MsoNormal><span style='font-size:14.0pt;mso-fareast-language:EN-US; |
---|
892 | mso-no-proof:yes'><!--[if gte vml 1]><v:shape id="Picture_x0020_4" o:spid="_x0000_i1028" |
---|
893 | type="#_x0000_t75" style='width:370pt;height:238pt;visibility:visible'> |
---|
894 | <v:imagedata src="FindProfParamCW_files/image007.png" o:title=""/> |
---|
895 | </v:shape><![endif]--><![if !vml]><img border=0 width=372 height=240 |
---|
896 | src="FindProfParamCW_files/image008.png" v:shapes="Picture_x0020_4"><![endif]></span><span |
---|
897 | style='font-size:14.0pt'><o:p></o:p></span></p> |
---|
898 | |
---|
899 | <p class=MsoNormal><span style='font-size:14.0pt'><o:p> </o:p></span></p> |
---|
900 | |
---|
901 | <p class=MsoNormal><b style='mso-bidi-font-weight:normal'><span |
---|
902 | style='font-size:14.0pt'>Move</span></b><span style='font-size:14.0pt'> the |
---|
903 | mouse to any of the data points close to the <b style='mso-bidi-font-weight: |
---|
904 | normal'>top of the first peak and click </b>the left mouse button. A line will be |
---|
905 | drawn through the peak and the position will be added to the peak table and a |
---|
906 | line marking this is added to the plot, as below. <o:p></o:p></span></p> |
---|
907 | |
---|
908 | <p class=MsoNormal><span style='font-size:14.0pt;mso-fareast-language:EN-US; |
---|
909 | mso-no-proof:yes'><!--[if gte vml 1]><v:shape id="Picture_x0020_5" o:spid="_x0000_i1029" |
---|
910 | type="#_x0000_t75" style='width:319pt;height:267pt;visibility:visible'> |
---|
911 | <v:imagedata src="FindProfParamCW_files/image009.png" o:title=""/> |
---|
912 | </v:shape><![endif]--><![if !vml]><img border=0 width=321 height=269 |
---|
913 | src="FindProfParamCW_files/image010.png" v:shapes="Picture_x0020_5"><![endif]></span><span |
---|
914 | style='font-size:14.0pt'><o:p></o:p></span></p> |
---|
915 | |
---|
916 | <p class=MsoNormal><span style='font-size:14.0pt'><o:p> </o:p></span></p> |
---|
917 | |
---|
918 | <p class=MsoNormal><b style='mso-bidi-font-weight:normal'><span |
---|
919 | style='font-size:14.0pt'>Repeat this for all 8 peaks</span></b><span |
---|
920 | style='font-size:14.0pt'> in the pattern. Note that if a peak is entered in the |
---|
921 | wrong place <span class=GramE>it can be moved by "dragging" it with |
---|
922 | the mouse</span>, or use a right-click to delete it. Be careful to make sure |
---|
923 | two peaks are not entered in the same place by accident.<o:p></o:p></span></p> |
---|
924 | |
---|
925 | <p class=MsoNormal><span style='font-size:14.0pt;mso-fareast-language:EN-US; |
---|
926 | mso-no-proof:yes'><!--[if gte vml 1]><v:shape id="Picture_x0020_6" o:spid="_x0000_i1030" |
---|
927 | type="#_x0000_t75" style='width:333pt;height:251pt;visibility:visible'> |
---|
928 | <v:imagedata src="FindProfParamCW_files/image011.png" o:title=""/> |
---|
929 | </v:shape><![endif]--><![if !vml]><img border=0 width=335 height=253 |
---|
930 | src="FindProfParamCW_files/image012.png" v:shapes="Picture_x0020_6"><![endif]><o:p></o:p></span></p> |
---|
931 | |
---|
932 | <p class=MsoNormal><span style='font-size:14.0pt;mso-fareast-language:EN-US; |
---|
933 | mso-no-proof:yes'>The peak table appears as:</span><span style='font-size:14.0pt'><o:p></o:p></span></p> |
---|
934 | |
---|
935 | <p class=MsoNormal><span style='font-size:14.0pt;mso-fareast-language:EN-US; |
---|
936 | mso-no-proof:yes'><!--[if gte vml 1]><v:shape id="Picture_x0020_7" o:spid="_x0000_i1031" |
---|
937 | type="#_x0000_t75" style='width:523pt;height:218pt;visibility:visible'> |
---|
938 | <v:imagedata src="FindProfParamCW_files/image013.png" o:title=""/> |
---|
939 | </v:shape><![endif]--><![if !vml]><img border=0 width=525 height=220 |
---|
940 | src="FindProfParamCW_files/image014.png" v:shapes="Picture_x0020_7"><![endif]></span><span |
---|
941 | style='font-size:14.0pt'><o:p></o:p></span></p> |
---|
942 | |
---|
943 | <p class=MsoNormal><span style='font-size:14.0pt'><o:p> </o:p></span></p> |
---|
944 | |
---|
945 | <h3><span style='font-size:14.0pt;mso-bidi-font-family:"Times New Roman"'>Step |
---|
946 | 5: Refine Peak Areas<o:p></o:p></span></h3> |
---|
947 | |
---|
948 | <p class=MsoNormal><span style='font-size:14.0pt'><o:p> </o:p></span></p> |
---|
949 | |
---|
950 | <p class=MsoNormal><span style='font-size:14.0pt'>By default, the peak |
---|
951 | intensities <span class=GramE>are flagged as to be varied</span>, but not any |
---|
952 | of the other parameters. It is wise to refine them all, but we want to make |
---|
953 | sure the parameters have a chance to converge one step at a time and we should |
---|
954 | start with only the intensities.<span style="mso-spacerun:yes"> |
---|
955 | </span>Use the <b style='mso-bidi-font-weight:normal'>Peak Fitting/<span |
---|
956 | class=SpellE>Peakfit</span></b> menu item to perform a peak refinement. You |
---|
957 | will be asked for a name to save the project (enter a name such as <span |
---|
958 | class=SpellE>peakfit.gpx</span> and press Save). The peaks are then fit, here |
---|
959 | optimizing only the intensity values. The console window shows the details of |
---|
960 | the refinement:<o:p></o:p></span></p> |
---|
961 | |
---|
962 | <p class=MsoNormal><span style='font-size:14.0pt'><o:p> </o:p></span></p> |
---|
963 | |
---|
964 | <p class=MsoNormal><span style='font-size:14.0pt;mso-fareast-language:EN-US; |
---|
965 | mso-no-proof:yes'><!--[if gte vml 1]><v:shape id="Picture_x0020_8" o:spid="_x0000_i1032" |
---|
966 | type="#_x0000_t75" style='width:475pt;height:178pt;visibility:visible'> |
---|
967 | <v:imagedata src="FindProfParamCW_files/image015.png" o:title=""/> |
---|
968 | </v:shape><![endif]--><![if !vml]><img border=0 width=477 height=180 |
---|
969 | src="FindProfParamCW_files/image016.png" v:shapes="Picture_x0020_8"><![endif]></span><span |
---|
970 | style='font-size:14.0pt'><o:p></o:p></span></p> |
---|
971 | |
---|
972 | <p class=MsoNormal><span style='font-size:14.0pt'>The warning at the end is |
---|
973 | because the default peak parameters describe a peak shape that is significantly |
---|
974 | sharper than what is actually present for these data; the step size is actually |
---|
975 | fine. This warning will later go away, but if it did not this would indicate |
---|
976 | that it would be better to recollect the data with a step size decreased by a |
---|
977 | factor of 3-4. <o:p></o:p></span></p> |
---|
978 | |
---|
979 | <p class=MsoNormal><span style='font-size:14.0pt'><o:p> </o:p></span></p> |
---|
980 | |
---|
981 | <h3><span style='font-size:14.0pt;mso-bidi-font-family:"Times New Roman"'>Step |
---|
982 | 6: Refine peak areas and heights<o:p></o:p></span></h3> |
---|
983 | |
---|
984 | <p class=MsoNormal><span style='font-size:14.0pt'><o:p> </o:p></span></p> |
---|
985 | |
---|
986 | <p class=MsoNormal><span style='font-size:14.0pt'>In the peak list window, <b |
---|
987 | style='mso-bidi-font-weight:normal'>double click in the refine heading for the |
---|
988 | peak position</b> <span class=GramE>flags,</span> this will bring up a dialog |
---|
989 | that allows all peak positions to be varied. <o:p></o:p></span></p> |
---|
990 | |
---|
991 | <p class=MsoNormal><span style='font-size:14.0pt;mso-fareast-language:EN-US; |
---|
992 | mso-no-proof:yes'><!--[if gte vml 1]><v:shape id="Picture_x0020_9" o:spid="_x0000_i1033" |
---|
993 | type="#_x0000_t75" style='width:158pt;height:123pt;visibility:visible'> |
---|
994 | <v:imagedata src="FindProfParamCW_files/image017.png" o:title=""/> |
---|
995 | </v:shape><![endif]--><![if !vml]><img border=0 width=160 height=125 |
---|
996 | src="FindProfParamCW_files/image018.png" v:shapes="Picture_x0020_9"><![endif]></span><span |
---|
997 | style='font-size:14.0pt'><span style="mso-spacerun:yes"> </span><o:p></o:p></span></p> |
---|
998 | |
---|
999 | <p class=MsoNormal><span style='font-size:14.0pt'>Select "vary all" |
---|
1000 | and press OK. Now all peak positions and areas will be refined.<o:p></o:p></span></p> |
---|
1001 | |
---|
1002 | <p class=MsoNormal><span style='font-size:14.0pt;mso-fareast-language:EN-US; |
---|
1003 | mso-no-proof:yes'><!--[if gte vml 1]><v:shape id="Picture_x0020_10" o:spid="_x0000_i1034" |
---|
1004 | type="#_x0000_t75" style='width:514pt;height:217pt;visibility:visible'> |
---|
1005 | <v:imagedata src="FindProfParamCW_files/image019.png" o:title=""/> |
---|
1006 | </v:shape><![endif]--><![if !vml]><img border=0 width=516 height=219 |
---|
1007 | src="FindProfParamCW_files/image020.png" v:shapes="Picture_x0020_10"><![endif]></span><span |
---|
1008 | style='font-size:14.0pt'><o:p></o:p></span></p> |
---|
1009 | |
---|
1010 | <p class=MsoNormal><span style='font-size:14.0pt'>Use the <b style='mso-bidi-font-weight: |
---|
1011 | normal'>Peak Fitting/<span class=SpellE>Peakfit</span></b> menu item to start |
---|
1012 | peak refinement.<o:p></o:p></span></p> |
---|
1013 | |
---|
1014 | <p class=MsoNormal><span style='font-size:14.0pt'><o:p> </o:p></span></p> |
---|
1015 | |
---|
1016 | <p class=MsoNormal><span style='font-size:14.0pt'>The fit improves significantly, |
---|
1017 | as below, but further improvements are needed. <o:p></o:p></span></p> |
---|
1018 | |
---|
1019 | <p class=MsoNormal><span style='font-size:14.0pt;mso-fareast-language:EN-US; |
---|
1020 | mso-no-proof:yes'><!--[if gte vml 1]><v:shape id="Picture_x0020_11" o:spid="_x0000_i1035" |
---|
1021 | type="#_x0000_t75" style='width:258pt;height:187pt;visibility:visible'> |
---|
1022 | <v:imagedata src="FindProfParamCW_files/image021.png" o:title=""/> |
---|
1023 | </v:shape><![endif]--><![if !vml]><img border=0 width=260 height=189 |
---|
1024 | src="FindProfParamCW_files/image022.png" v:shapes="Picture_x0020_11"><![endif]></span><span |
---|
1025 | style='font-size:14.0pt'><o:p></o:p></span></p> |
---|
1026 | |
---|
1027 | <p class=MsoNormal><span style='font-size:14.0pt'><o:p> </o:p></span></p> |
---|
1028 | |
---|
1029 | <h3><span style='font-size:14.0pt;mso-bidi-font-family:"Times New Roman"'>Step |
---|
1030 | 7: Refine peak areas, heights and widths (optional)<o:p></o:p></span></h3> |
---|
1031 | |
---|
1032 | <p class=MsoNormal><span style='font-size:14.0pt'><o:p> </o:p></span></p> |
---|
1033 | |
---|
1034 | <p class=MsoNormal><b style='mso-bidi-font-weight:normal'><span |
---|
1035 | style='font-size:14.0pt'>Double-Click</span></b><span style='font-size:14.0pt'> |
---|
1036 | on the refine headings for the <b style='mso-bidi-font-weight:normal'>sigma</b> |
---|
1037 | (Gaussian width) and <b style='mso-bidi-font-weight:normal'>gamma</b> |
---|
1038 | (Lorentzian width) parameters so that all parameters can be refined. Use the <b |
---|
1039 | style='mso-bidi-font-weight:normal'>Peak Fitting/<span class=SpellE>Peakfit</span></b> |
---|
1040 | menu item to start peak refinement. The results in the console window are as |
---|
1041 | below.<span style="mso-spacerun:yes"> </span>This is being done here just |
---|
1042 | to see how the individual peaks vary before we fit them with a parametric |
---|
1043 | equation. This step is not necessary, but provides a useful graphical reference |
---|
1044 | to look for any anomalous peaks that one might not want to use.<span |
---|
1045 | style="mso-spacerun:yes"> </span><o:p></o:p></span></p> |
---|
1046 | |
---|
1047 | <p class=MsoNormal><span style='font-size:14.0pt'><o:p> </o:p></span></p> |
---|
1048 | |
---|
1049 | <p class=MsoNormal><span style='font-size:14.0pt'><!--[if gte vml 1]><v:shape |
---|
1050 | id="_x0000_i1036" type="#_x0000_t75" style='width:6in;height:2in'> |
---|
1051 | <v:imagedata src="FindProfParamCW_files/image023.png" o:title=""/> |
---|
1052 | </v:shape><![endif]--><![if !vml]><img border=0 width=434 height=146 |
---|
1053 | src="FindProfParamCW_files/image024.png" v:shapes="_x0000_i1036"><![endif]><o:p></o:p></span></p> |
---|
1054 | |
---|
1055 | <p class=MsoNormal><span style='font-size:14.0pt'><o:p> </o:p></span></p> |
---|
1056 | |
---|
1057 | <h3><span style='font-size:14.0pt;mso-bidi-font-family:"Times New Roman"'>Step |
---|
1058 | 8: Add more Background terms<o:p></o:p></span></h3> |
---|
1059 | |
---|
1060 | <p class=MsoNormal><span style='font-size:14.0pt'><o:p> </o:p></span></p> |
---|
1061 | |
---|
1062 | <p class=MsoNormal><span style='font-size:14.0pt'>Use the zoom feature |
---|
1063 | (magnifying glass) to draw a box around the low intensity data<o:p></o:p></span></p> |
---|
1064 | |
---|
1065 | <p class=MsoNormal><span style='font-size:14.0pt'><o:p> </o:p></span></p> |
---|
1066 | |
---|
1067 | <p class=MsoNormal><span style='font-size:14.0pt'><!--[if gte vml 1]><v:shape |
---|
1068 | id="_x0000_i1037" type="#_x0000_t75" style='width:441pt;height:180pt'> |
---|
1069 | <v:imagedata src="FindProfParamCW_files/image025.png" o:title="fig"/> |
---|
1070 | </v:shape><![endif]--><![if !vml]><img border=0 width=443 height=182 |
---|
1071 | src="FindProfParamCW_files/image026.png" v:shapes="_x0000_i1037"><![endif]><o:p></o:p></span></p> |
---|
1072 | |
---|
1073 | <p class=MsoNormal><span style='font-size:14.0pt'>Looking at the plot (see |
---|
1074 | below<span class=GramE>),</span> makes it clear that the background is not well |
---|
1075 | fit. Adding more background terms will fix this. <o:p></o:p></span></p> |
---|
1076 | |
---|
1077 | <p class=MsoNormal><span style='font-size:14.0pt'><!--[if gte vml 1]><v:shape |
---|
1078 | id="_x0000_i1038" type="#_x0000_t75" style='width:431pt;height:324pt'> |
---|
1079 | <v:imagedata src="FindProfParamCW_files/image027.png" o:title=""/> |
---|
1080 | </v:shape><![endif]--><![if !vml]><img border=0 width=433 height=326 |
---|
1081 | src="FindProfParamCW_files/image028.png" v:shapes="_x0000_i1038"><![endif]><o:p></o:p></span></p> |
---|
1082 | |
---|
1083 | <p class=MsoNormal><span style='font-size:14.0pt'><o:p> </o:p></span></p> |
---|
1084 | |
---|
1085 | <p class=MsoNormal><span style='font-size:14.0pt'>Select the <b |
---|
1086 | style='mso-bidi-font-weight:normal'>Background</b> tree item and change the <b |
---|
1087 | style='mso-bidi-font-weight:normal'>number of coefficients to 6</b>, as shown |
---|
1088 | below. <o:p></o:p></span></p> |
---|
1089 | |
---|
1090 | <p class=MsoNormal><span style='font-size:14.0pt'><!--[if gte vml 1]><v:shape |
---|
1091 | id="_x0000_i1039" type="#_x0000_t75" style='width:553pt;height:231pt'> |
---|
1092 | <v:imagedata src="FindProfParamCW_files/image029.png" o:title=""/> |
---|
1093 | </v:shape><![endif]--><![if !vml]><img border=0 width=555 height=233 |
---|
1094 | src="FindProfParamCW_files/image030.png" v:shapes="_x0000_i1039"><![endif]><o:p></o:p></span></p> |
---|
1095 | |
---|
1096 | <p class=MsoNormal><span style='font-size:14.0pt'>Then return to the <b |
---|
1097 | style='mso-bidi-font-weight:normal'>Peak List</b> data tree item and use the <b |
---|
1098 | style='mso-bidi-font-weight:normal'>Peak Fitting/<span class=SpellE>Peakfit</span></b> |
---|
1099 | menu item to perform a peak refinement. At this point it is instructive to |
---|
1100 | click on the <b style='mso-bidi-font-weight:normal'>Instrument Parameters</b> |
---|
1101 | data tree item to see a plot of peak widths:<o:p></o:p></span></p> |
---|
1102 | |
---|
1103 | <p class=MsoNormal><span style='font-size:14.0pt'><!--[if gte vml 1]><v:shape |
---|
1104 | id="_x0000_i1040" type="#_x0000_t75" style='width:457pt;height:374pt'> |
---|
1105 | <v:imagedata src="FindProfParamCW_files/image031.png" o:title=""/> |
---|
1106 | </v:shape><![endif]--><![if !vml]><img border=0 width=459 height=376 |
---|
1107 | src="FindProfParamCW_files/image032.png" v:shapes="_x0000_i1040"><![endif]><o:p></o:p></span></p> |
---|
1108 | |
---|
1109 | <p class=MsoNormal><span style='font-size:14.0pt'>Note that the solid curves |
---|
1110 | here are plots of the profile coefficients from the default instrument |
---|
1111 | parameters (which are unimportant here), but the fits for the individual peaks |
---|
1112 | are shown (in units of Q/delta-Q <span class=SpellE>vs</span> Q), with |
---|
1113 | Lorentzian widths (gamma) in green, Gaussian widths (sigma) in red and their |
---|
1114 | convolution (total broadening) in blue. <o:p></o:p></span></p> |
---|
1115 | |
---|
1116 | <p class=MsoNormal><span style='font-size:14.0pt'><o:p> </o:p></span></p> |
---|
1117 | |
---|
1118 | <h3><span style='font-size:14.0pt;mso-bidi-font-family:"Times New Roman"'>Step |
---|
1119 | 9: Refine Profile Parameters<o:p></o:p></span></h3> |
---|
1120 | |
---|
1121 | <p class=MsoNormal><span style='font-size:14.0pt'><o:p> </o:p></span></p> |
---|
1122 | |
---|
1123 | <p class=MsoNormal><span style='font-size:14.0pt'>Now, select the profile terms |
---|
1124 | to be <b style='mso-bidi-font-weight:normal'>refine</b>d. Use <b |
---|
1125 | style='mso-bidi-font-weight:normal'>Gaussian U, V, & W and Lorentzian X |
---|
1126 | & Y</b> (note that Z, which provides constant broadening, independent of Q, |
---|
1127 | is provided as an option, but is rarely if ever needed.)<o:p></o:p></span></p> |
---|
1128 | |
---|
1129 | <p class=MsoNormal><span style='font-size:14.0pt'><!--[if gte vml 1]><v:shape |
---|
1130 | id="_x0000_i1041" type="#_x0000_t75" style='width:505pt;height:263pt'> |
---|
1131 | <v:imagedata src="FindProfParamCW_files/image033.png" o:title=""/> |
---|
1132 | </v:shape><![endif]--><![if !vml]><img border=0 width=507 height=265 |
---|
1133 | src="FindProfParamCW_files/image034.png" v:shapes="_x0000_i1041"><![endif]><o:p></o:p></span></p> |
---|
1134 | |
---|
1135 | <p class=MsoNormal><span style='font-size:14.0pt'><o:p> </o:p></span></p> |
---|
1136 | |
---|
1137 | <p class=MsoNormal><span style='font-size:14.0pt'>Note that these U, V & W |
---|
1138 | values will be used to set the Gaussian peak widths for those peaks where sigma |
---|
1139 | is not being refined and likewise X, Y & Z will be used to determine the Lorentzian |
---|
1140 | widths where gamma is not refined for that peak. If we had any peaks that were |
---|
1141 | not consistent with the width of the others, we might choose to continue to |
---|
1142 | refine their individual profile terms (sigma & gamma), if that is done the |
---|
1143 | peaks varied individually would be excluded from the U, V, W, X & Y |
---|
1144 | refinements. Here we will refine U, V, W, X & Y against all peaks. To do |
---|
1145 | this, select the <b style='mso-bidi-font-weight:normal'>Peak List data</b> tree |
---|
1146 | item and <b style='mso-bidi-font-weight:normal'>remove refinement of sigma |
---|
1147 | & gamma</b> for all peaks by double-clicking on the refine column headers |
---|
1148 | for each and select "N – vary none" so that the table appears |
---|
1149 | as below:<o:p></o:p></span></p> |
---|
1150 | |
---|
1151 | <p class=MsoNormal><span style='font-size:14.0pt'><!--[if gte vml 1]><v:shape |
---|
1152 | id="_x0000_i1042" type="#_x0000_t75" style='width:533pt;height:207pt'> |
---|
1153 | <v:imagedata src="FindProfParamCW_files/image035.png" o:title=""/> |
---|
1154 | </v:shape><![endif]--><![if !vml]><img border=0 width=535 height=209 |
---|
1155 | src="FindProfParamCW_files/image036.png" v:shapes="_x0000_i1042"><![endif]><o:p></o:p></span></p> |
---|
1156 | |
---|
1157 | <p class=MsoNormal><span style='font-size:14.0pt'><o:p> </o:p></span></p> |
---|
1158 | |
---|
1159 | <p class=MsoNormal><span style='font-size:14.0pt'>Use the <b style='mso-bidi-font-weight: |
---|
1160 | normal'>Peak Fitting/<span class=SpellE>Peakfit</span></b> menu item to perform |
---|
1161 | a peak refinement optimizing U, V, W, <span class=GramE>X</span> & Y:<o:p></o:p></span></p> |
---|
1162 | |
---|
1163 | <p class=MsoNormal><span style='font-size:14.0pt'><o:p> </o:p></span></p> |
---|
1164 | |
---|
1165 | <p class=MsoNormal><span style='font-size:14.0pt'><!--[if gte vml 1]><v:shape |
---|
1166 | id="_x0000_i1043" type="#_x0000_t75" style='width:510pt;height:198pt'> |
---|
1167 | <v:imagedata src="FindProfParamCW_files/image037.png" o:title=""/> |
---|
1168 | </v:shape><![endif]--><![if !vml]><img border=0 width=512 height=200 |
---|
1169 | src="FindProfParamCW_files/image038.png" v:shapes="_x0000_i1043"><![endif]><o:p></o:p></span></p> |
---|
1170 | |
---|
1171 | <p class=MsoNormal><span style='font-size:14.0pt'>Note that the sigma and gamma |
---|
1172 | values are now computed from U, V, & W and X & Y, respectively. The |
---|
1173 | difference curve shows very small deviations.<o:p></o:p></span></p> |
---|
1174 | |
---|
1175 | <p class=MsoNormal><span style='font-size:14.0pt'><span |
---|
1176 | style="mso-spacerun:yes"> </span><!--[if gte vml 1]><v:shape id="_x0000_i1044" |
---|
1177 | type="#_x0000_t75" style='width:460pt;height:323pt'> |
---|
1178 | <v:imagedata src="FindProfParamCW_files/image039.png" o:title=""/> |
---|
1179 | </v:shape><![endif]--><![if !vml]><img border=0 width=462 height=325 |
---|
1180 | src="FindProfParamCW_files/image040.png" v:shapes="_x0000_i1044"><![endif]><o:p></o:p></span></p> |
---|
1181 | |
---|
1182 | <p class=MsoNormal><span style='font-size:14.0pt'>Note that the background is |
---|
1183 | also quite well fit now. <o:p></o:p></span></p> |
---|
1184 | |
---|
1185 | <h3><span style='font-size:14.0pt;mso-bidi-font-family:"Times New Roman"'>Step |
---|
1186 | 10: Save the Profile Parameters<o:p></o:p></span></h3> |
---|
1187 | |
---|
1188 | <p class=MsoNormal><span style='font-size:14.0pt'><o:p> </o:p></span></p> |
---|
1189 | |
---|
1190 | <p class=MsoNormal><span style='font-size:14.0pt'>So that we can use these |
---|
1191 | profile terms as the starting point for a future refinement, <b |
---|
1192 | style='mso-bidi-font-weight:normal'>save the profile terms</b> to a file by |
---|
1193 | clicking on the <b style='mso-bidi-font-weight:normal'>Instrumental Parameters</b> |
---|
1194 | data tree item and use the <b style='mso-bidi-font-weight:normal'>Operations/Save |
---|
1195 | Profile</b> menu command. Give the file a name that will be helpful for future |
---|
1196 | use (<<span class=SpellE><i style='mso-bidi-font-style:normal'>MyInstrument</i></span><i |
---|
1197 | style='mso-bidi-font-style:normal'>></i>20-70deg.instparm might be good) and |
---|
1198 | put this file in the directory(s) where you will keep your data files. <o:p></o:p></span></p> |
---|
1199 | |
---|
1200 | <p class=MsoNormal><span style='font-size:14.0pt'><o:p> </o:p></span></p> |
---|
1201 | |
---|
1202 | <p class=MsoNormal><span style='font-size:14.0pt'>Clicking on the Instrument |
---|
1203 | Parameters data tree item will show the peak widths from U, V, W, X & Y, |
---|
1204 | and also the individual peak widths generated from those values (not very |
---|
1205 | useful). For a more useful plot we refining the individual peak widths |
---|
1206 | independently again, as shown in the next section. <o:p></o:p></span></p> |
---|
1207 | |
---|
1208 | <h3><span style='font-size:14.0pt;mso-bidi-font-family:"Times New Roman"'>Step |
---|
1209 | 11: Plot Profile Parameters with Individual Peak Widths (optional)<o:p></o:p></span></h3> |
---|
1210 | |
---|
1211 | <p class=MsoNormal><span style='font-size:14.0pt'><o:p> </o:p></span></p> |
---|
1212 | |
---|
1213 | <p class=MsoNormal><span style='font-size:14.0pt'>First we <b style='mso-bidi-font-weight: |
---|
1214 | normal'>stop refining U, V, W, <span class=GramE>X</span> & Y</b> by |
---|
1215 | clicking on <b style='mso-bidi-font-weight:normal'>Instrumental Parameters</b> |
---|
1216 | data tree item and turning the refinement flags off. <o:p></o:p></span></p> |
---|
1217 | |
---|
1218 | <p class=MsoNormal><span style='font-size:14.0pt'><!--[if gte vml 1]><v:shape |
---|
1219 | id="_x0000_i1045" type="#_x0000_t75" style='width:393pt;height:254pt'> |
---|
1220 | <v:imagedata src="FindProfParamCW_files/image041.png" o:title=""/> |
---|
1221 | </v:shape><![endif]--><![if !vml]><img border=0 width=395 height=256 |
---|
1222 | src="FindProfParamCW_files/image042.png" v:shapes="_x0000_i1045"><![endif]><o:p></o:p></span></p> |
---|
1223 | |
---|
1224 | <p class=MsoNormal><span style='font-size:14.0pt'>In the <b style='mso-bidi-font-weight: |
---|
1225 | normal'>Peak List</b> data tree item, turn on<b style='mso-bidi-font-weight: |
---|
1226 | normal'> refine</b>ment of<b style='mso-bidi-font-weight:normal'> all |
---|
1227 | individual peak widths</b> (as we did in Step 7)<o:p></o:p></span></p> |
---|
1228 | |
---|
1229 | <p class=MsoNormal><span style='font-size:14.0pt'><!--[if gte vml 1]><v:shape |
---|
1230 | id="_x0000_i1046" type="#_x0000_t75" style='width:545pt;height:195pt'> |
---|
1231 | <v:imagedata src="FindProfParamCW_files/image043.png" o:title=""/> |
---|
1232 | </v:shape><![endif]--><![if !vml]><img border=0 width=547 height=197 |
---|
1233 | src="FindProfParamCW_files/image044.png" v:shapes="_x0000_i1046"><![endif]><o:p></o:p></span></p> |
---|
1234 | |
---|
1235 | <p class=MsoNormal><span class=GramE><span style='font-size:14.0pt'>and</span></span><span |
---|
1236 | style='font-size:14.0pt'> use the <b style='mso-bidi-font-weight:normal'>Peak |
---|
1237 | Fitting/<span class=SpellE>Peakfit</span></b> menu item to perform a peak |
---|
1238 | refinement optimizing individual peak widths, as before. Returning to the <b |
---|
1239 | style='mso-bidi-font-weight:normal'>Instrumental Parameters</b> data tree item |
---|
1240 | provides this plot:<o:p></o:p></span></p> |
---|
1241 | |
---|
1242 | <p class=MsoNormal><span style='font-size:14.0pt'><o:p> </o:p></span></p> |
---|
1243 | |
---|
1244 | <p class=MsoNormal><span style='font-size:14.0pt'><!--[if gte vml 1]><v:shape |
---|
1245 | id="_x0000_i1047" type="#_x0000_t75" style='width:537pt;height:426pt'> |
---|
1246 | <v:imagedata src="FindProfParamCW_files/image045.png" o:title=""/> |
---|
1247 | </v:shape><![endif]--><![if !vml]><img border=0 width=539 height=428 |
---|
1248 | src="FindProfParamCW_files/image046.png" v:shapes="_x0000_i1047"><![endif]><o:p></o:p></span></p> |
---|
1249 | |
---|
1250 | <p class=MsoNormal><span style='font-size:14.0pt'>The displayed lines and |
---|
1251 | points are as follows, where Lorentzian widths are shown in green, Gaussian |
---|
1252 | widths are in red and their convolution (total broadening) is shown in blue: <o:p></o:p></span></p> |
---|
1253 | |
---|
1254 | <p class=MsoNormal style='margin-left:.5in;text-indent:-.25in;mso-list:l0 level1 lfo2'><![if !supportLists]><span |
---|
1255 | style='font-size:14.0pt;font-family:Symbol;mso-fareast-font-family:Symbol; |
---|
1256 | mso-bidi-font-family:Symbol'><span style='mso-list:Ignore'>á<span |
---|
1257 | style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><b |
---|
1258 | style='mso-bidi-font-weight:normal'><span style='font-size:14.0pt'>Solid curves</span></b><span |
---|
1259 | style='font-size:14.0pt'>: profile terms from original instrument parameter |
---|
1260 | file (here the <span class=SpellE>CuKa</span> lab data defaults). Note since X, |
---|
1261 | Y & Z are zero, there is only Gaussian broadening and the total broadening |
---|
1262 | is exactly the same as the Gaussian so the blue curve hides the red one. <o:p></o:p></span></p> |
---|
1263 | |
---|
1264 | <p class=MsoNormal style='margin-left:.5in;text-indent:-.25in;mso-list:l0 level1 lfo2'><![if !supportLists]><span |
---|
1265 | style='font-size:14.0pt;font-family:Symbol;mso-fareast-font-family:Symbol; |
---|
1266 | mso-bidi-font-family:Symbol'><span style='mso-list:Ignore'>á<span |
---|
1267 | style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><b |
---|
1268 | style='mso-bidi-font-weight:normal'><span style='font-size:14.0pt'>Dashed |
---|
1269 | curves:</span></b><span style='font-size:14.0pt'> <span class=GramE>these |
---|
1270 | values are generated by U, V & W and X, Y & Z. Note that the broadening |
---|
1271 | from this instrument is significantly greater than the default</span> values. <o:p></o:p></span></p> |
---|
1272 | |
---|
1273 | <p class=MsoNormal style='margin-left:.5in;text-indent:-.25in;mso-list:l0 level1 lfo2'><![if !supportLists]><span |
---|
1274 | style='font-size:14.0pt;font-family:Symbol;mso-fareast-font-family:Symbol; |
---|
1275 | mso-bidi-font-family:Symbol'><span style='mso-list:Ignore'>á<span |
---|
1276 | style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><b |
---|
1277 | style='mso-bidi-font-weight:normal'><span style='font-size:14.0pt'>Plus signs |
---|
1278 | (points):</span></b><span style='font-size:14.0pt'> these are the widths for |
---|
1279 | the individual reflections unconstrained. Note that they agree well with the |
---|
1280 | fitted curves (dashed lines).<span style="mso-spacerun:yes"> </span><o:p></o:p></span></p> |
---|
1281 | |
---|
1282 | <p class=MsoNormal><span style='font-size:14.0pt'><o:p> </o:p></span></p> |
---|
1283 | |
---|
1284 | <p class=MsoNormal><i style='mso-bidi-font-style:normal'><span |
---|
1285 | style='font-size:14.0pt'>These profile terms are more than adequate for most |
---|
1286 | structural fitting problems, but it should be noted that these values are not sufficient |
---|
1287 | to obtain quantitative measurements of <span class=SpellE>microstrain</span> |
---|
1288 | and/or crystallite size. To obtain even better terms the instrument profile is |
---|
1289 | best determined by a Rietveld fit for (with a standard where <span |
---|
1290 | class=SpellE>microstrain</span> and size are known to be negligible or at least |
---|
1291 | have certified values) Those certified values should be set as input values and |
---|
1292 | not refined to allow U, V, W, X, and Y to be further refined. Ideally, in |
---|
1293 | addition to higher angle data, the sample would also have lower angle peaks and |
---|
1294 | SH/L can also be refined. <o:p></o:p></span></i></p> |
---|
1295 | |
---|
1296 | <p class=MsoNormal><span style='font-size:14.0pt'><o:p> </o:p></span></p> |
---|
1297 | |
---|
1298 | <h1>Part 2: Test the Profile Parameters</h1> |
---|
1299 | |
---|
1300 | <p class=MsoNormal><o:p> </o:p></p> |
---|
1301 | |
---|
1302 | <p class=MsoNormal><span style='font-size:14.0pt'>The obvious question will be |
---|
1303 | how well do these parameters fit the data? To test this, we can start a new |
---|
1304 | refinement using these parameters and see how well they do. <o:p></o:p></span></p> |
---|
1305 | |
---|
1306 | <p class=MsoNormal><span style='font-size:14.0pt'><o:p> </o:p></span></p> |
---|
1307 | |
---|
1308 | <p class=MsoNormal><span class=Heading3Char><span style='font-size:14.0pt'>Step |
---|
1309 | 2.1: Read in the Diffraction Data</span></span><span style='font-size:14.0pt'><o:p></o:p></span></p> |
---|
1310 | |
---|
1311 | <p class=MsoNormal><span style='font-size:14.0pt'><o:p> </o:p></span></p> |
---|
1312 | |
---|
1313 | <p class=MsoNormal style='mso-pagination:none;tab-stops:28.0pt 56.0pt 84.0pt 112.0pt 140.0pt 168.0pt 196.0pt 224.0pt 3.5in 280.0pt 308.0pt 336.0pt; |
---|
1314 | mso-layout-grid-align:none;text-autospace:none'><span style='font-size:14.0pt'>Use |
---|
1315 | File/New Project to create an empty project. You can say <span class=GramE>Yes</span> |
---|
1316 | to the prompt to save the current project (No would not hurt.) As before, <span |
---|
1317 | class=GramE>use <b style='mso-bidi-font-weight:normal'>Import/Powder Data/from <span |
---|
1318 | class=SpellE>Bruker</span> RAW file</b> to read <span style='font-family:Courier'>file</span></span></span><span |
---|
1319 | style='font-size:14.0pt;font-family:Courier'> </span><span style='font-size: |
---|
1320 | 14.0pt;font-family:Courier;mso-bidi-font-family:"Menlo Regular";color:black; |
---|
1321 | mso-fareast-language:EN-US'>LaB6_Jan2018.raw</span><span style='font-size:14.0pt; |
---|
1322 | font-family:"Menlo Regular";color:black;mso-fareast-language:EN-US'> </span><span |
---|
1323 | style='font-size:14.0pt'>from the Tutorials <span class=SpellE>CWInstDemo</span>/data |
---|
1324 | directory (downloaded already from <a |
---|
1325 | href="https://subversion.xray.aps.anl.gov/pyGSAS/Tutorials/CWInstDemo/data/">https://subversion.xray.aps.anl.gov/pyGSAS/Tutorials/CWInstDemo/data/</a>). |
---|
1326 | After selecting this file, answer yes to "Is this the file you want?"<o:p></o:p></span></p> |
---|
1327 | |
---|
1328 | <p class=MsoNormal><span style='font-size:14.0pt'><o:p> </o:p></span></p> |
---|
1329 | |
---|
1330 | <h3><span style='font-size:14.0pt;mso-bidi-font-family:"Times New Roman"'>Step |
---|
1331 | 2.2: Select New Instrument Parameters<o:p></o:p></span></h3> |
---|
1332 | |
---|
1333 | <p class=MsoNormal><span style='font-size:14.0pt'><o:p> </o:p></span></p> |
---|
1334 | |
---|
1335 | <p class=MsoNormal><span style='font-size:14.0pt'>The next dialog to appear is |
---|
1336 | titled, "Choose inst. <span class=SpellE>Param</span> file for |
---|
1337 | LaB6_Jan2018.raw Scan 1 unlike before, we do have profile terms to read, from |
---|
1338 | the file created in Step 10, above. Select the file written before (such as |
---|
1339 | <<span class=SpellE><i style='mso-bidi-font-style:normal'>MyInstrument</i></span><i |
---|
1340 | style='mso-bidi-font-style:normal'>></i>20-<span class=GramE>70deg.instparm |
---|
1341 | )</span> and <b style='mso-bidi-font-weight:normal'>press OK</b>.<span |
---|
1342 | style="mso-spacerun:yes"> </span>Note that you may need to change the |
---|
1343 | file filter to see files of <span class=GramE>type .<span class=SpellE>instparm</span></span>. |
---|
1344 | <o:p></o:p></span></p> |
---|
1345 | |
---|
1346 | <p class=MsoNormal><span style='font-size:14.0pt'><o:p> </o:p></span></p> |
---|
1347 | |
---|
1348 | <p class=MsoNormal><span style='font-size:14.0pt'>At present, the instrument |
---|
1349 | type is not saved, so go to the Sample Parameters data tree item for the new |
---|
1350 | histogram and change the <b style='mso-bidi-font-weight:normal'>Diffractometer |
---|
1351 | type</b> from Debye-<span class=SpellE>Scherrer</span> <b style='mso-bidi-font-weight: |
---|
1352 | normal'>to Bragg-Brentano</b>.<o:p></o:p></span></p> |
---|
1353 | |
---|
1354 | <p class=MsoNormal><span style='font-size:14.0pt'><o:p> </o:p></span></p> |
---|
1355 | |
---|
1356 | <p class=MsoNormal><span style='font-size:14.0pt'>(<span class=GramE>before</span>)<o:p></o:p></span></p> |
---|
1357 | |
---|
1358 | <p class=MsoNormal><span style='font-size:14.0pt;mso-fareast-language:EN-US; |
---|
1359 | mso-no-proof:yes'><!--[if gte vml 1]><v:shape id="Picture_x0020_24" o:spid="_x0000_i1048" |
---|
1360 | type="#_x0000_t75" style='width:377pt;height:183pt;visibility:visible; |
---|
1361 | mso-wrap-style:square'> |
---|
1362 | <v:imagedata src="FindProfParamCW_files/image047.png" o:title=""/> |
---|
1363 | </v:shape><![endif]--><![if !vml]><img border=0 width=379 height=185 |
---|
1364 | src="FindProfParamCW_files/image048.png" v:shapes="Picture_x0020_24"><![endif]></span><span |
---|
1365 | style='font-size:14.0pt'><o:p></o:p></span></p> |
---|
1366 | |
---|
1367 | <p class=MsoNormal><span style='font-size:14.0pt'><o:p> </o:p></span></p> |
---|
1368 | |
---|
1369 | <p class=MsoNormal><span style='font-size:14.0pt'>(<span class=GramE>after</span>)<o:p></o:p></span></p> |
---|
1370 | |
---|
1371 | <p class=MsoNormal><span style='font-size:14.0pt;mso-fareast-language:EN-US; |
---|
1372 | mso-no-proof:yes'><!--[if gte vml 1]><v:shape id="Picture_x0020_25" o:spid="_x0000_i1049" |
---|
1373 | type="#_x0000_t75" style='width:372pt;height:83pt;visibility:visible; |
---|
1374 | mso-wrap-style:square'> |
---|
1375 | <v:imagedata src="FindProfParamCW_files/image049.png" o:title=""/> |
---|
1376 | </v:shape><![endif]--><![if !vml]><img border=0 width=374 height=85 |
---|
1377 | src="FindProfParamCW_files/image050.png" v:shapes="Picture_x0020_25"><![endif]></span><span |
---|
1378 | style='font-size:14.0pt'><o:p></o:p></span></p> |
---|
1379 | |
---|
1380 | <h3><span style='font-size:14.0pt;mso-bidi-font-family:"Times New Roman"'>Step |
---|
1381 | 2.3: Add Phase<o:p></o:p></span></h3> |
---|
1382 | |
---|
1383 | <p class=MsoNormal><span style='font-size:14.0pt'><o:p> </o:p></span></p> |
---|
1384 | |
---|
1385 | <p class=MsoNormal><span style='font-size:14.0pt'>We will add a phase for <span |
---|
1386 | class=GramE>LaB6,</span> since this is a simple material we will input this by |
---|
1387 | hand rather than trying to import it. <b style='mso-bidi-font-weight:normal'>Use |
---|
1388 | Data/Add new phase</b> to create a new phase. <b style='mso-bidi-font-weight: |
---|
1389 | normal'>Enter any name</b> you choose, though LaB6 is a good choice and <b |
---|
1390 | style='mso-bidi-font-weight:normal'>press OK</b>. <o:p></o:p></span></p> |
---|
1391 | |
---|
1392 | <p class=MsoNormal><span style='font-size:14.0pt'><o:p> </o:p></span></p> |
---|
1393 | |
---|
1394 | <p class=MsoNormal><span style='font-size:14.0pt'>The symmetry and cell need to |
---|
1395 | be edited on the new phase's General tab. <b style='mso-bidi-font-weight:normal'>Click |
---|
1396 | on the Space Group Button</b> (which defaults to P1) and <b style='mso-bidi-font-weight: |
---|
1397 | normal'>enter P m -3 m</b> (note use of spaces to separate symmetry axes |
---|
1398 | – though in this case since this is a standard setting, omitting the |
---|
1399 | spaces works too. <span class=GramE>The space group symmetry information is |
---|
1400 | displayed</span>, <span class=GramE><b style='mso-bidi-font-weight:normal'>click |
---|
1401 | OK</b></span>. <o:p></o:p></span></p> |
---|
1402 | |
---|
1403 | <p class=MsoNormal><span style='font-size:14.0pt;mso-fareast-language:EN-US; |
---|
1404 | mso-no-proof:yes'><!--[if gte vml 1]><v:shape id="Picture_x0020_26" o:spid="_x0000_i1050" |
---|
1405 | type="#_x0000_t75" style='width:191pt;height:246pt;visibility:visible; |
---|
1406 | mso-wrap-style:square'> |
---|
1407 | <v:imagedata src="FindProfParamCW_files/image051.png" o:title=""/> |
---|
1408 | </v:shape><![endif]--><![if !vml]><img border=0 width=193 height=248 |
---|
1409 | src="FindProfParamCW_files/image052.png" v:shapes="Picture_x0020_26"><![endif]></span><span |
---|
1410 | style='font-size:14.0pt'><o:p></o:p></span></p> |
---|
1411 | |
---|
1412 | <p class=MsoNormal><span style='font-size:14.0pt'><o:p> </o:p></span></p> |
---|
1413 | |
---|
1414 | <p class=MsoNormal><b style='mso-bidi-font-weight:normal'><span |
---|
1415 | style='font-size:14.0pt'>Change the lattice constant</span></b><span |
---|
1416 | style='font-size:14.0pt'> (<i style='mso-bidi-font-style:normal'>a</i>) from |
---|
1417 | 1.0 to <b style='mso-bidi-font-weight:normal'>4.15689</b> A. (The value for SRM |
---|
1418 | 660b)<o:p></o:p></span></p> |
---|
1419 | |
---|
1420 | <p class=MsoNormal><span style="mso-spacerun:yes"> </span><span |
---|
1421 | style='font-size:14.0pt;mso-fareast-language:EN-US;mso-no-proof:yes'><!--[if gte vml 1]><v:shape |
---|
1422 | id="Picture_x0020_38" o:spid="_x0000_i1051" type="#_x0000_t75" style='width:5in; |
---|
1423 | height:135pt;visibility:visible;mso-wrap-style:square'> |
---|
1424 | <v:imagedata src="FindProfParamCW_files/image053.png" o:title=""/> |
---|
1425 | </v:shape><![endif]--><![if !vml]><img border=0 width=362 height=137 |
---|
1426 | src="FindProfParamCW_files/image054.png" v:shapes="Picture_x0020_38"><![endif]></span><span |
---|
1427 | style='font-size:14.0pt'><o:p></o:p></span></p> |
---|
1428 | |
---|
1429 | <p class=MsoNormal><span style='font-size:14.0pt'><o:p> </o:p></span></p> |
---|
1430 | |
---|
1431 | <p class=MsoNormal><span style='font-size:14.0pt'>Finally add atoms to the |
---|
1432 | phase by <b style='mso-bidi-font-weight:normal'>clicking on the Atoms</b> <b |
---|
1433 | style='mso-bidi-font-weight:normal'>tab</b>. Use the <b style='mso-bidi-font-weight: |
---|
1434 | normal'>Edit Atoms/Append atom</b> menu item to insert an atom. A new atom is |
---|
1435 | included in the table.<o:p></o:p></span></p> |
---|
1436 | |
---|
1437 | <p class=MsoNormal><span style='font-size:14.0pt;mso-fareast-language:EN-US; |
---|
1438 | mso-no-proof:yes'><!--[if gte vml 1]><v:shape id="Picture_x0020_29" o:spid="_x0000_i1052" |
---|
1439 | type="#_x0000_t75" style='width:505pt;height:71pt;visibility:visible; |
---|
1440 | mso-wrap-style:square'> |
---|
1441 | <v:imagedata src="FindProfParamCW_files/image055.png" o:title=""/> |
---|
1442 | </v:shape><![endif]--><![if !vml]><img border=0 width=507 height=73 |
---|
1443 | src="FindProfParamCW_files/image056.png" v:shapes="Picture_x0020_29"><![endif]></span><span |
---|
1444 | style='font-size:14.0pt'><o:p></o:p></span></p> |
---|
1445 | |
---|
1446 | <p class=MsoNormal><b style='mso-bidi-font-weight:normal'><span |
---|
1447 | style='font-size:14.0pt'>Double-Click</span></b><span style='font-size:14.0pt'> |
---|
1448 | on the <b style='mso-bidi-font-weight:normal'>Type</b> value (H) and which |
---|
1449 | opens a periodic table window. Click on the <b style='mso-bidi-font-weight: |
---|
1450 | normal'>arrow next to La</b> to bring up a menu of the defined valences<o:p></o:p></span></p> |
---|
1451 | |
---|
1452 | <p class=MsoNormal><span style='font-size:14.0pt;mso-fareast-language:EN-US; |
---|
1453 | mso-no-proof:yes'><!--[if gte vml 1]><v:shape id="Picture_x0020_30" o:spid="_x0000_i1053" |
---|
1454 | type="#_x0000_t75" style='width:94pt;height:106pt;visibility:visible; |
---|
1455 | mso-wrap-style:square'> |
---|
1456 | <v:imagedata src="FindProfParamCW_files/image057.png" o:title=""/> |
---|
1457 | </v:shape><![endif]--><![if !vml]><img border=0 width=96 height=108 |
---|
1458 | src="FindProfParamCW_files/image058.png" v:shapes="Picture_x0020_30"><![endif]></span><span |
---|
1459 | style='font-size:14.0pt'><span style="mso-spacerun:yes"> </span><o:p></o:p></span></p> |
---|
1460 | |
---|
1461 | <p class=MsoNormal><b style='mso-bidi-font-weight:normal'><span |
---|
1462 | style='font-size:14.0pt'>Select La</span></b><span style='font-size:14.0pt'> |
---|
1463 | (neutral atoms are usually preferred) from that pull-down and the period table |
---|
1464 | window closes. This atom is located at position 0,0,0 so no further editing is |
---|
1465 | needed. For completeness add the second by using the <b style='mso-bidi-font-weight: |
---|
1466 | normal'>Edit Atoms/Append atom</b> menu item again. <span class=GramE>to</span> |
---|
1467 | insert an atom. For the second atom, change the type to boron by <b |
---|
1468 | style='mso-bidi-font-weight:normal'>Double-Clicking</b> on the <b |
---|
1469 | style='mso-bidi-font-weight:normal'>Type</b> value (H) and selecting B (the |
---|
1470 | only choice) from the pull-down. The coordinates for this atom are |
---|
1471 | 0.1975,0.5,0.5 so the x, y and z values must be edited.<o:p></o:p></span></p> |
---|
1472 | |
---|
1473 | <p class=MsoNormal><span style='font-size:14.0pt;mso-fareast-language:EN-US; |
---|
1474 | mso-no-proof:yes'><!--[if gte vml 1]><v:shape id="Picture_x0020_31" o:spid="_x0000_i1054" |
---|
1475 | type="#_x0000_t75" style='width:513pt;height:56pt;visibility:visible; |
---|
1476 | mso-wrap-style:square'> |
---|
1477 | <v:imagedata src="FindProfParamCW_files/image059.png" o:title=""/> |
---|
1478 | </v:shape><![endif]--><![if !vml]><img border=0 width=515 height=58 |
---|
1479 | src="FindProfParamCW_files/image060.png" v:shapes="Picture_x0020_31"><![endif]></span><span |
---|
1480 | style='font-size:14.0pt'><o:p></o:p></span></p> |
---|
1481 | |
---|
1482 | <p class=MsoNormal><span style='font-size:14.0pt'>Note that the site |
---|
1483 | multiplicities indicate that the stoichiometry is La<sub>1</sub>B<sub>6</sub>, |
---|
1484 | as is expected.<o:p></o:p></span></p> |
---|
1485 | |
---|
1486 | <p class=MsoNormal><span style='font-size:14.0pt'><o:p> </o:p></span></p> |
---|
1487 | |
---|
1488 | <h3><span style='font-size:14.0pt;mso-bidi-font-family:"Times New Roman"'>Step |
---|
1489 | 2.4: Link Histogram and Phase<o:p></o:p></span></h3> |
---|
1490 | |
---|
1491 | <p class=MsoNormal><span style='font-size:14.0pt'><o:p> </o:p></span></p> |
---|
1492 | |
---|
1493 | <p class=MsoNormal><b style='mso-bidi-font-weight:normal'><span |
---|
1494 | style='font-size:14.0pt'>Click</span></b><span style='font-size:14.0pt'> on the |
---|
1495 | <b style='mso-bidi-font-weight:normal'>Data tab</b> for the phase. Note that |
---|
1496 | there are no associated histograms:<o:p></o:p></span></p> |
---|
1497 | |
---|
1498 | <p class=MsoNormal><span style='font-size:14.0pt;mso-fareast-language:EN-US; |
---|
1499 | mso-no-proof:yes'><!--[if gte vml 1]><v:shape id="Picture_x0020_35" o:spid="_x0000_i1055" |
---|
1500 | type="#_x0000_t75" style='width:626pt;height:125pt;visibility:visible; |
---|
1501 | mso-wrap-style:square'> |
---|
1502 | <v:imagedata src="FindProfParamCW_files/image061.png" o:title=""/> |
---|
1503 | </v:shape><![endif]--><![if !vml]><img border=0 width=628 height=127 |
---|
1504 | src="FindProfParamCW_files/image062.png" v:shapes="Picture_x0020_35"><![endif]></span><span |
---|
1505 | style='font-size:14.0pt'><o:p></o:p></span></p> |
---|
1506 | |
---|
1507 | <p class=MsoNormal><span style='font-size:14.0pt'><o:p> </o:p></span></p> |
---|
1508 | |
---|
1509 | <p class=MsoNormal><span style='font-size:14.0pt'>Use the <b style='mso-bidi-font-weight: |
---|
1510 | normal'>Edit Phase/Add Powder Histogram</b> menu command. <b style='mso-bidi-font-weight: |
---|
1511 | normal'>Select</b> the one histogram and <b style='mso-bidi-font-weight:normal'>press |
---|
1512 | OK</b>.<span style="mso-spacerun:yes"> </span><o:p></o:p></span></p> |
---|
1513 | |
---|
1514 | <p class=MsoNormal><span style='font-size:14.0pt;mso-fareast-language:EN-US; |
---|
1515 | mso-no-proof:yes'><!--[if gte vml 1]><v:shape id="Picture_x0020_36" o:spid="_x0000_i1056" |
---|
1516 | type="#_x0000_t75" style='width:250pt;height:190pt;visibility:visible; |
---|
1517 | mso-wrap-style:square'> |
---|
1518 | <v:imagedata src="FindProfParamCW_files/image063.png" o:title=""/> |
---|
1519 | </v:shape><![endif]--><![if !vml]><img border=0 width=252 height=192 |
---|
1520 | src="FindProfParamCW_files/image064.png" v:shapes="Picture_x0020_36"><![endif]></span><span |
---|
1521 | style='font-size:14.0pt'><o:p></o:p></span></p> |
---|
1522 | |
---|
1523 | <p class=MsoNormal><span style='font-size:14.0pt'>Nothing needs to be changed |
---|
1524 | of the new parameters added here:<o:p></o:p></span></p> |
---|
1525 | |
---|
1526 | <p class=MsoNormal><span style='font-size:14.0pt;mso-fareast-language:EN-US; |
---|
1527 | mso-no-proof:yes'><!--[if gte vml 1]><v:shape id="Picture_x0020_37" o:spid="_x0000_i1057" |
---|
1528 | type="#_x0000_t75" style='width:490pt;height:268pt;visibility:visible; |
---|
1529 | mso-wrap-style:square'> |
---|
1530 | <v:imagedata src="FindProfParamCW_files/image065.png" o:title=""/> |
---|
1531 | </v:shape><![endif]--><![if !vml]><img border=0 width=492 height=270 |
---|
1532 | src="FindProfParamCW_files/image066.png" v:shapes="Picture_x0020_37"><![endif]></span><span |
---|
1533 | style='font-size:14.0pt'><o:p></o:p></span></p> |
---|
1534 | |
---|
1535 | <p class=MsoNormal><span style='font-size:14.0pt'><o:p> </o:p></span></p> |
---|
1536 | |
---|
1537 | <h3><span style='font-size:14.0pt;mso-bidi-font-family:"Times New Roman"'>Step |
---|
1538 | 2.5: Refine Histogram Parameters<o:p></o:p></span></h3> |
---|
1539 | |
---|
1540 | <p class=MsoNormal><span style='font-size:14.0pt'><o:p> </o:p></span></p> |
---|
1541 | |
---|
1542 | <p class=MsoNormal><span style='font-size:14.0pt'>We will first change a few |
---|
1543 | histogram parameters. For data tree item <b style='mso-bidi-font-weight:normal'>Limits |
---|
1544 | change <span class=SpellE>Tmin</span> to 20</b> degrees, as was done before in |
---|
1545 | step 3. <o:p></o:p></span></p> |
---|
1546 | |
---|
1547 | <p class=MsoNormal><span style='font-size:14.0pt;mso-fareast-language:EN-US; |
---|
1548 | mso-no-proof:yes'><!--[if gte vml 1]><v:shape id="Picture_x0020_32" o:spid="_x0000_i1058" |
---|
1549 | type="#_x0000_t75" style='width:311pt;height:95pt;visibility:visible; |
---|
1550 | mso-wrap-style:square'> |
---|
1551 | <v:imagedata src="FindProfParamCW_files/image067.png" o:title=""/> |
---|
1552 | </v:shape><![endif]--><![if !vml]><img border=0 width=313 height=97 |
---|
1553 | src="FindProfParamCW_files/image068.png" v:shapes="Picture_x0020_32"><![endif]></span><span |
---|
1554 | style='font-size:14.0pt'><o:p></o:p></span></p> |
---|
1555 | |
---|
1556 | <p class=MsoNormal><span style='font-size:14.0pt'>For data tree item <b |
---|
1557 | style='mso-bidi-font-weight:normal'>Background change </b>the Number of <span |
---|
1558 | class=SpellE><b style='mso-bidi-font-weight:normal'>coeff</b></span>. <span |
---|
1559 | class=GramE><b style='mso-bidi-font-weight:normal'>to</b></span><b |
---|
1560 | style='mso-bidi-font-weight:normal'> 6</b>, as was done before in step 8. <o:p></o:p></span></p> |
---|
1561 | |
---|
1562 | <p class=MsoNormal><span style='font-size:14.0pt;mso-fareast-language:EN-US; |
---|
1563 | mso-no-proof:yes'><!--[if gte vml 1]><v:shape id="Picture_x0020_33" o:spid="_x0000_i1059" |
---|
1564 | type="#_x0000_t75" style='width:406pt;height:109pt;visibility:visible; |
---|
1565 | mso-wrap-style:square'> |
---|
1566 | <v:imagedata src="FindProfParamCW_files/image069.png" o:title=""/> |
---|
1567 | </v:shape><![endif]--><![if !vml]><img border=0 width=408 height=111 |
---|
1568 | src="FindProfParamCW_files/image070.png" v:shapes="Picture_x0020_33"><![endif]></span><span |
---|
1569 | style='font-size:14.0pt'><o:p></o:p></span></p> |
---|
1570 | |
---|
1571 | <p class=MsoNormal><span style='font-size:14.0pt'><o:p> </o:p></span></p> |
---|
1572 | |
---|
1573 | <p class=MsoNormal><span style='font-size:14.0pt'>Note that the refinement flag |
---|
1574 | is on by default. We will <u>not refine</u> any of the Instrument parameters |
---|
1575 | but we will refine the <b style='mso-bidi-font-weight:normal'>histogram scale |
---|
1576 | factor (only)</b> on the <b style='mso-bidi-font-weight:normal'>Sample |
---|
1577 | Parameters</b>.<o:p></o:p></span></p> |
---|
1578 | |
---|
1579 | <p class=MsoNormal><span style='font-size:14.0pt;mso-fareast-language:EN-US; |
---|
1580 | mso-no-proof:yes'><!--[if gte vml 1]><v:shape id="Picture_x0020_34" o:spid="_x0000_i1060" |
---|
1581 | type="#_x0000_t75" style='width:391pt;height:177pt;visibility:visible; |
---|
1582 | mso-wrap-style:square'> |
---|
1583 | <v:imagedata src="FindProfParamCW_files/image071.png" o:title=""/> |
---|
1584 | </v:shape><![endif]--><![if !vml]><img border=0 width=393 height=179 |
---|
1585 | src="FindProfParamCW_files/image072.png" v:shapes="Picture_x0020_34"><![endif]></span><span |
---|
1586 | style='font-size:14.0pt'><o:p></o:p></span></p> |
---|
1587 | |
---|
1588 | <p class=MsoNormal><span style='font-size:14.0pt'><o:p> </o:p></span></p> |
---|
1589 | |
---|
1590 | <p class=MsoNormal><span style='font-size:14.0pt'>Use the <b style='mso-bidi-font-weight: |
---|
1591 | normal'>Calculate/Refine</b> menu item to start refinement.<span |
---|
1592 | style="mso-spacerun:yes"> </span>The program will prompt requesting a |
---|
1593 | name for the <span class=GramE>newly-created</span> .<span class=SpellE>gpx</span> |
---|
1594 | file. <o:p></o:p></span></p> |
---|
1595 | |
---|
1596 | <p class=MsoNormal><span style='font-size:14.0pt'><o:p> </o:p></span></p> |
---|
1597 | |
---|
1598 | <p class=MsoNormal><span style='font-size:14.0pt'>The fit is not very good. <b |
---|
1599 | style='mso-bidi-font-weight:normal'>Clicking</b> on the histogram's (<b |
---|
1600 | style='mso-bidi-font-weight:normal'>PWDR</b>) data tree item and zooming in |
---|
1601 | shows that the <span class=GramE>tick are</span> not well aligned with the |
---|
1602 | peaks. This is due to sample displacement. <o:p></o:p></span></p> |
---|
1603 | |
---|
1604 | <p class=MsoNormal><span style='font-size:14.0pt;mso-fareast-language:EN-US; |
---|
1605 | mso-no-proof:yes'><!--[if gte vml 1]><v:shape id="Picture_x0020_40" o:spid="_x0000_i1061" |
---|
1606 | type="#_x0000_t75" style='width:419pt;height:309pt;visibility:visible; |
---|
1607 | mso-wrap-style:square'> |
---|
1608 | <v:imagedata src="FindProfParamCW_files/image073.png" o:title=""/> |
---|
1609 | </v:shape><![endif]--><![if !vml]><img border=0 width=421 height=311 |
---|
1610 | src="FindProfParamCW_files/image074.png" v:shapes="Picture_x0020_40"><![endif]></span><span |
---|
1611 | style='font-size:14.0pt'><o:p></o:p></span></p> |
---|
1612 | |
---|
1613 | <p class=MsoNormal><span style='font-size:14.0pt'><o:p> </o:p></span></p> |
---|
1614 | |
---|
1615 | <h3><span style='font-size:14.0pt;mso-bidi-font-family:"Times New Roman"'>Step |
---|
1616 | 2.6: Refine an additional Histogram Parameter<o:p></o:p></span></h3> |
---|
1617 | |
---|
1618 | <p class=MsoNormal><span style='font-size:14.0pt'><o:p> </o:p></span></p> |
---|
1619 | |
---|
1620 | <p class=MsoNormal><span style='font-size:14.0pt'>The position of the sample is |
---|
1621 | never well determined in a Bragg-Brentano instrument, so the sample |
---|
1622 | displacement should always be varied. Click on <b style='mso-bidi-font-weight: |
---|
1623 | normal'>Sample Parameters </b>and turn on refinement of <b style='mso-bidi-font-weight: |
---|
1624 | normal'>Sample displacement</b>.<o:p></o:p></span></p> |
---|
1625 | |
---|
1626 | <p class=MsoNormal><span style='font-size:14.0pt;mso-fareast-language:EN-US; |
---|
1627 | mso-no-proof:yes'><!--[if gte vml 1]><v:shape id="Picture_x0020_41" o:spid="_x0000_i1062" |
---|
1628 | type="#_x0000_t75" style='width:338pt;height:192pt;visibility:visible; |
---|
1629 | mso-wrap-style:square'> |
---|
1630 | <v:imagedata src="FindProfParamCW_files/image075.png" o:title=""/> |
---|
1631 | </v:shape><![endif]--><![if !vml]><img border=0 width=340 height=194 |
---|
1632 | src="FindProfParamCW_files/image076.png" v:shapes="Picture_x0020_41"><![endif]></span><span |
---|
1633 | style='font-size:14.0pt'><o:p></o:p></span></p> |
---|
1634 | |
---|
1635 | <p class=MsoNormal><span style='font-size:14.0pt'><o:p> </o:p></span></p> |
---|
1636 | |
---|
1637 | <p class=MsoNormal><span style='font-size:14.0pt'>Use the <b style='mso-bidi-font-weight: |
---|
1638 | normal'>Calculate/Refine</b> menu item to start another refinement.<span |
---|
1639 | style="mso-spacerun:yes"> </span>Significant improvement is seen and even |
---|
1640 | more if <b style='mso-bidi-font-weight:normal'>Calculate/Refine</b> is used a |
---|
1641 | second time. <o:p></o:p></span></p> |
---|
1642 | |
---|
1643 | <p class=MsoNormal><span style='font-size:14.0pt;mso-fareast-language:EN-US; |
---|
1644 | mso-no-proof:yes'><!--[if gte vml 1]><v:shape id="Picture_x0020_42" o:spid="_x0000_i1063" |
---|
1645 | type="#_x0000_t75" style='width:425pt;height:315pt;visibility:visible; |
---|
1646 | mso-wrap-style:square'> |
---|
1647 | <v:imagedata src="FindProfParamCW_files/image077.png" o:title=""/> |
---|
1648 | </v:shape><![endif]--><![if !vml]><img border=0 width=427 height=317 |
---|
1649 | src="FindProfParamCW_files/image078.png" v:shapes="Picture_x0020_42"><![endif]></span><span |
---|
1650 | style='font-size:14.0pt'><o:p></o:p></span></p> |
---|
1651 | |
---|
1652 | <p class=MsoNormal><span style='font-size:14.0pt;mso-fareast-language:EN-US; |
---|
1653 | mso-no-proof:yes'><!--[if gte vml 1]><v:shape id="Picture_x0020_43" o:spid="_x0000_i1064" |
---|
1654 | type="#_x0000_t75" style='width:425pt;height:296pt;visibility:visible; |
---|
1655 | mso-wrap-style:square'> |
---|
1656 | <v:imagedata src="FindProfParamCW_files/image079.png" o:title=""/> |
---|
1657 | </v:shape><![endif]--><![if !vml]><img border=0 width=427 height=298 |
---|
1658 | src="FindProfParamCW_files/image080.png" v:shapes="Picture_x0020_43"><![endif]></span><span |
---|
1659 | style='font-size:14.0pt'><o:p></o:p></span></p> |
---|
1660 | |
---|
1661 | <h3><span style='font-size:14.0pt;mso-bidi-font-family:"Times New Roman"'>Step |
---|
1662 | 2.6: Turn on Le Bail fitting<o:p></o:p></span></h3> |
---|
1663 | |
---|
1664 | <p class=MsoNormal><span style='font-size:14.0pt'>Part of the problem in the |
---|
1665 | fit is that the intensities are not well fit in the model. Rather than fitting |
---|
1666 | the few free structural parameters (x for B and <span class=SpellE>Uiso</span> |
---|
1667 | values), we will treat the intensities are arbitrary using Le Bail fitting. <span |
---|
1668 | class=GramE>This is done by clicking on the <b style='mso-bidi-font-weight: |
---|
1669 | normal'>Phase tree item</b></span> and the <b style='mso-bidi-font-weight:normal'>Data |
---|
1670 | tab</b> and <b style='mso-bidi-font-weight:normal'>setting</b> the <b |
---|
1671 | style='mso-bidi-font-weight:normal'>do <span class=SpellE>LeBail</span></b> |
---|
1672 | extraction flag.<o:p></o:p></span></p> |
---|
1673 | |
---|
1674 | <p class=MsoNormal><span style='font-size:14.0pt;mso-fareast-language:EN-US; |
---|
1675 | mso-no-proof:yes'><!--[if gte vml 1]><v:shape id="Picture_x0020_44" o:spid="_x0000_i1065" |
---|
1676 | type="#_x0000_t75" style='width:469pt;height:97pt;visibility:visible; |
---|
1677 | mso-wrap-style:square'> |
---|
1678 | <v:imagedata src="FindProfParamCW_files/image081.png" o:title=""/> |
---|
1679 | </v:shape><![endif]--><![if !vml]><img border=0 width=471 height=99 |
---|
1680 | src="FindProfParamCW_files/image082.png" v:shapes="Picture_x0020_44"><![endif]></span><span |
---|
1681 | style='font-size:14.0pt'><span style="mso-spacerun:yes"> </span><o:p></o:p></span></p> |
---|
1682 | |
---|
1683 | <p class=MsoNormal><span style='font-size:14.0pt'><o:p> </o:p></span></p> |
---|
1684 | |
---|
1685 | <p class=MsoNormal><span style='font-size:14.0pt'>Use the <b style='mso-bidi-font-weight: |
---|
1686 | normal'>Calculate/Refine</b> menu item to start another refinement.<span |
---|
1687 | style="mso-spacerun:yes"> </span>A warning message that "Steepest |
---|
1688 | Descents dominates" this is because a high degree of parameter correlation |
---|
1689 | occurs as the reflection intensities change. The fit does not improve very much |
---|
1690 | if <b style='mso-bidi-font-weight:normal'>Calculate/Refine</b> is used a second |
---|
1691 | time but the warning goes away. <o:p></o:p></span></p> |
---|
1692 | |
---|
1693 | <h3><span style='font-size:14.0pt;mso-bidi-font-family:"Times New Roman"'><o:p> </o:p></span></h3> |
---|
1694 | |
---|
1695 | <h3><span style='font-size:14.0pt;mso-bidi-font-family:"Times New Roman"'>Step |
---|
1696 | 2.7: Fit Lattice<o:p></o:p></span></h3> |
---|
1697 | |
---|
1698 | <p class=MsoNormal><span style='font-size:14.0pt'>While this should not be |
---|
1699 | needed for a standard, it is clear by looking at the plots that peaks are still |
---|
1700 | not quite line up. In a less dense sample it might be reasonable to refine the |
---|
1701 | sample transparency, but here the only reasonable parameter is to refine the |
---|
1702 | lattice. On the <b style='mso-bidi-font-weight:normal'>Phase</b>'s <b |
---|
1703 | style='mso-bidi-font-weight:normal'>General</b> tab press the <b |
---|
1704 | style='mso-bidi-font-weight:normal'>Refine unit cell</b> control.<o:p></o:p></span></p> |
---|
1705 | |
---|
1706 | <p class=MsoNormal><span style='font-size:14.0pt;mso-fareast-language:EN-US; |
---|
1707 | mso-no-proof:yes'><!--[if gte vml 1]><v:shape id="Picture_x0020_46" o:spid="_x0000_i1066" |
---|
1708 | type="#_x0000_t75" style='width:354pt;height:129pt;visibility:visible; |
---|
1709 | mso-wrap-style:square'> |
---|
1710 | <v:imagedata src="FindProfParamCW_files/image083.png" o:title=""/> |
---|
1711 | </v:shape><![endif]--><![if !vml]><img border=0 width=356 height=131 |
---|
1712 | src="FindProfParamCW_files/image084.png" v:shapes="Picture_x0020_46"><![endif]></span><span |
---|
1713 | style='font-size:14.0pt'><o:p></o:p></span></p> |
---|
1714 | |
---|
1715 | <p class=MsoNormal><span style='font-size:14.0pt'>Use the <b style='mso-bidi-font-weight: |
---|
1716 | normal'>Calculate/Refine</b> menu item to start another refinement and the |
---|
1717 | positioning of the peaks improves significantly. <o:p></o:p></span></p> |
---|
1718 | |
---|
1719 | <h3><span style='font-size:14.0pt;mso-bidi-font-family:"Times New Roman"'>Step |
---|
1720 | 2.8: Fit <span class=SpellE>MicroStrain</span><o:p></o:p></span></h3> |
---|
1721 | |
---|
1722 | <p class=MsoNormal><span style='font-size:14.0pt'>The remaining major problem |
---|
1723 | is that we have not treated the sample broadening and LaB6 does have some <span |
---|
1724 | class=SpellE>microstrain</span>. That can be refined with the <b |
---|
1725 | style='mso-bidi-font-weight:normal'>Phase</b>'s <b style='mso-bidi-font-weight: |
---|
1726 | normal'>Data</b> tab with the <span class=SpellE>microstrain</span> control.<o:p></o:p></span></p> |
---|
1727 | |
---|
1728 | <p class=MsoNormal><span style='font-size:14.0pt;mso-fareast-language:EN-US; |
---|
1729 | mso-no-proof:yes'><!--[if gte vml 1]><v:shape id="Picture_x0020_45" o:spid="_x0000_i1067" |
---|
1730 | type="#_x0000_t75" style='width:729pt;height:104pt;visibility:visible; |
---|
1731 | mso-wrap-style:square'> |
---|
1732 | <v:imagedata src="FindProfParamCW_files/image085.png" o:title=""/> |
---|
1733 | </v:shape><![endif]--><![if !vml]><img border=0 width=731 height=106 |
---|
1734 | src="FindProfParamCW_files/image086.png" v:shapes="Picture_x0020_45"><![endif]></span><span |
---|
1735 | style='font-size:14.0pt'><o:p></o:p></span></p> |
---|
1736 | |
---|
1737 | <p class=MsoNormal><span style='font-size:14.0pt'><o:p> </o:p></span></p> |
---|
1738 | |
---|
1739 | <p class=MsoNormal><span style='font-size:14.0pt'>Use the <b style='mso-bidi-font-weight: |
---|
1740 | normal'>Calculate/Refine</b> menu item to start another refinement. A second |
---|
1741 | refinement cycle brings the <span class=SpellE>Rw</span> to circa 5.8%. The fit |
---|
1742 | improves dramatically and <span class=SpellE>microstrain</span> refines to a |
---|
1743 | non-physical negative value. This is because our somewhat naive approach above |
---|
1744 | assumed no sample broadening. <o:p></o:p></span></p> |
---|
1745 | |
---|
1746 | <p class=MsoNormal><span style='font-size:14.0pt'><o:p> </o:p></span></p> |
---|
1747 | |
---|
1748 | <p class=MsoNormal><i style='mso-bidi-font-style:normal'><span |
---|
1749 | style='font-size:14.0pt'>This shows why if you are planning to measure <span |
---|
1750 | class=SpellE>microstrain</span> and/or crystallite size quantitatively, you |
---|
1751 | should determine instrument profile using a Rietveld fit with a standard with |
---|
1752 | known values for the <span class=SpellE>microstrain</span> and size. Fix the |
---|
1753 | size and <span class=SpellE>microstrain</span> to the known values when fitting |
---|
1754 | the data from the standard. <o:p></o:p></span></i></p> |
---|
1755 | |
---|
1756 | <h3><span style='font-size:14.0pt;mso-bidi-font-family:"Times New Roman"'>Step |
---|
1757 | 2.9: Additional Parameters<o:p></o:p></span></h3> |
---|
1758 | |
---|
1759 | <p class=MsoNormal><span style='font-size:14.0pt'>For these data, it appears |
---|
1760 | the ratio of Kalpha1 and Kalpha2 is not exactly the theoretical value of 0.5. |
---|
1761 | This can happen due to monochromator tuning. Allowing this to shift slightly by |
---|
1762 | including brings the <span class=SpellE>Rw</span> to circa 4.9%.<o:p></o:p></span></p> |
---|
1763 | |
---|
1764 | <p class=MsoNormal><span style='font-size:14.0pt;mso-fareast-language:EN-US; |
---|
1765 | mso-no-proof:yes'><!--[if gte vml 1]><v:shape id="Picture_x0020_47" o:spid="_x0000_i1068" |
---|
1766 | type="#_x0000_t75" style='width:277pt;height:88pt;visibility:visible; |
---|
1767 | mso-wrap-style:square'> |
---|
1768 | <v:imagedata src="FindProfParamCW_files/image087.png" o:title=""/> |
---|
1769 | </v:shape><![endif]--><![if !vml]><img border=0 width=279 height=90 |
---|
1770 | src="FindProfParamCW_files/image088.png" v:shapes="Picture_x0020_47"><![endif]></span><span |
---|
1771 | style='font-size:14.0pt'><o:p></o:p></span></p> |
---|
1772 | |
---|
1773 | <p class=MsoNormal><span style='font-size:14.0pt'>The fit is quite good without |
---|
1774 | fitting the instrumental profile terms: <o:p></o:p></span></p> |
---|
1775 | |
---|
1776 | <p class=MsoNormal><span style='font-size:14.0pt;mso-fareast-language:EN-US; |
---|
1777 | mso-no-proof:yes'><!--[if gte vml 1]><v:shape id="Picture_x0020_49" o:spid="_x0000_i1069" |
---|
1778 | type="#_x0000_t75" style='width:627pt;height:363pt;visibility:visible; |
---|
1779 | mso-wrap-style:square'> |
---|
1780 | <v:imagedata src="FindProfParamCW_files/image089.png" o:title=""/> |
---|
1781 | </v:shape><![endif]--><![if !vml]><img border=0 width=629 height=365 |
---|
1782 | src="FindProfParamCW_files/image090.png" v:shapes="Picture_x0020_49"><![endif]></span><span |
---|
1783 | style='font-size:14.0pt'><o:p></o:p></span></p> |
---|
1784 | |
---|
1785 | <p class=MsoNormal><span style='font-size:14.0pt'><o:p> </o:p></span></p> |
---|
1786 | |
---|
1787 | <h3><span style='font-size:14.0pt;mso-bidi-font-family:"Times New Roman"'>Step |
---|
1788 | 2.10: Profile Term Quality Check<o:p></o:p></span></h3> |
---|
1789 | |
---|
1790 | <p class=MsoNormal><span style='font-size:14.0pt'>The quality of the profile |
---|
1791 | parameters we previously fit can be demonstrated by turning off refinement of |
---|
1792 | the <span class=SpellE>microstrain</span> term and refining the U, V, W and X |
---|
1793 | & Y terms. This produces a small improvement in the fit (expected as one |
---|
1794 | fitting parameter as been replaced by 5), but the changes are very small, as |
---|
1795 | noted by the Instrument Parameter terms plot:<o:p></o:p></span></p> |
---|
1796 | |
---|
1797 | <p class=MsoNormal><span style='font-size:14.0pt;mso-fareast-language:EN-US; |
---|
1798 | mso-no-proof:yes'><!--[if gte vml 1]><v:shape id="Picture_x0020_48" o:spid="_x0000_i1070" |
---|
1799 | type="#_x0000_t75" style='width:531pt;height:395pt;visibility:visible; |
---|
1800 | mso-wrap-style:square'> |
---|
1801 | <v:imagedata src="FindProfParamCW_files/image091.png" o:title=""/> |
---|
1802 | </v:shape><![endif]--><![if !vml]><img border=0 width=533 height=397 |
---|
1803 | src="FindProfParamCW_files/image092.png" v:shapes="Picture_x0020_48"><![endif]><o:p></o:p></span></p> |
---|
1804 | |
---|
1805 | <h1>Part 3: Fitting data over a wider range<o:p></o:p></h1> |
---|
1806 | |
---|
1807 | <p class=MsoNormal><o:p> </o:p></p> |
---|
1808 | |
---|
1809 | <p class=MsoNormal><span style='font-size:14.0pt'>In this section we fit a |
---|
1810 | pattern with a wider range of data. This proceeds quite simply. <o:p></o:p></span></p> |
---|
1811 | |
---|
1812 | <h3><span style='font-size:14.0pt;mso-bidi-font-family:"Times New Roman"'>Step |
---|
1813 | 3.1: Start new project and read in data<o:p></o:p></span></h3> |
---|
1814 | |
---|
1815 | <p class=MsoNormal><o:p> </o:p></p> |
---|
1816 | |
---|
1817 | <p class=MsoNormal><span style='font-size:14.0pt'>Restart GSAS-II or use the |
---|
1818 | File/New <span class=GramE>Project<span style="mso-spacerun:yes"> |
---|
1819 | </span>to</span> create a new empty project. <o:p></o:p></span></p> |
---|
1820 | |
---|
1821 | <p class=MsoNormal style='mso-pagination:none;tab-stops:28.0pt 56.0pt 84.0pt 112.0pt 140.0pt 168.0pt 196.0pt 224.0pt 3.5in 280.0pt 308.0pt 336.0pt; |
---|
1822 | mso-layout-grid-align:none;text-autospace:none'><span style='font-size:14.0pt'>Use |
---|
1823 | <b style='mso-bidi-font-weight:normal'>Import/Powder Data/from GSAS powder data |
---|
1824 | file</b> to read </span><span style='font-size:14.0pt;font-family:Courier'>file |
---|
1825 | NIST660CBI.gsas</span><span style='font-size:14.0pt;font-family:"Menlo Regular"; |
---|
1826 | color:black;mso-fareast-language:EN-US'> </span><span style='font-size:14.0pt'>from |
---|
1827 | the Tutorials <span class=SpellE>CWInstDemo</span>/data directory (download |
---|
1828 | from <a |
---|
1829 | href="https://subversion.xray.aps.anl.gov/pyGSAS/Tutorials/CWInstDemo/data/">https://subversion.xray.aps.anl.gov/pyGSAS/Tutorials/CWInstDemo/data/</a>). |
---|
1830 | After selecting this file, answer yes to "Is this the file you want?<span |
---|
1831 | class=GramE>".</span> As before, use Cancel to select the default <span |
---|
1832 | class=SpellE>CuKa</span> lab data instrument parameters. <o:p></o:p></span></p> |
---|
1833 | |
---|
1834 | <h3><span style='font-size:14.0pt;mso-bidi-font-family:"Times New Roman"'>Step |
---|
1835 | 3.2: Change Data Range<o:p></o:p></span></h3> |
---|
1836 | |
---|
1837 | <p class=MsoNormal><o:p> </o:p></p> |
---|
1838 | |
---|
1839 | <p class=MsoNormal><span style='font-size:14.0pt'>Since the background is quite |
---|
1840 | curved at lower angles, reducing the angular range to be fit will require fewer |
---|
1841 | background terms. Select Limits in the data tree and then set <span |
---|
1842 | class=SpellE>Tmin</span> to 20.<span style="mso-spacerun:yes"> |
---|
1843 | </span>Then select Background in the tree and change the number of background |
---|
1844 | parameters to 8. <o:p></o:p></span></p> |
---|
1845 | |
---|
1846 | <h3><span style='font-size:14.0pt;mso-bidi-font-family:"Times New Roman"'>Step |
---|
1847 | 3.3: Add Peaks<o:p></o:p></span></h3> |
---|
1848 | |
---|
1849 | <p class=MsoNormal><span style='font-size:14.0pt'><o:p> </o:p></span></p> |
---|
1850 | |
---|
1851 | <p class=MsoNormal><span style='font-size:14.0pt'>Select Peak List from the |
---|
1852 | tree allows adding peaks. Zooming in on the lower portion of the pattern makes |
---|
1853 | it easier to see all the peaks. Be sure to click on magnification icon a second |
---|
1854 | time to turn off zoom mode. Then click on a point for each of the 20 peaks in |
---|
1855 | the pattern. You should have a plot that looks like this: <o:p></o:p></span></p> |
---|
1856 | |
---|
1857 | <p class=MsoNormal><span style='font-size:14.0pt;mso-fareast-language:EN-US; |
---|
1858 | mso-no-proof:yes'><!--[if gte vml 1]><v:shape id="_x0000_i1075" type="#_x0000_t75" |
---|
1859 | style='width:375pt;height:330pt;visibility:visible;mso-wrap-style:square'> |
---|
1860 | <v:imagedata src="FindProfParamCW_files/image093.png" o:title=""/> |
---|
1861 | </v:shape><![endif]--><![if !vml]><img border=0 width=377 height=332 |
---|
1862 | src="FindProfParamCW_files/image094.png" v:shapes="_x0000_i1075"><![endif]></span><span |
---|
1863 | style='font-size:14.0pt'><o:p></o:p></span></p> |
---|
1864 | |
---|
1865 | <h3><span style='font-size:14.0pt;mso-bidi-font-family:"Times New Roman"'>Step |
---|
1866 | 3.3: Fit Peaks<o:p></o:p></span></h3> |
---|
1867 | |
---|
1868 | <p class=MsoNormal><span style='font-size:14.0pt'><o:p> </o:p></span></p> |
---|
1869 | |
---|
1870 | <p class=MsoNormal><span style='font-size:14.0pt'>As the peaks are initially |
---|
1871 | added to the table, the refine flag is set for the peak intensity. Fit the |
---|
1872 | individual peak intensities by using Peak Fitting/<span class=SpellE>Peakfit</span> |
---|
1873 | menu command. Provide a file name and the <span class=SpellE>Rwp</span> drops |
---|
1874 | to ~40% with a reasonable background level, but not good peak shapes. <o:p></o:p></span></p> |
---|
1875 | |
---|
1876 | <p class=MsoNormal><span style='font-size:14.0pt'><o:p> </o:p></span></p> |
---|
1877 | |
---|
1878 | <p class=MsoNormal><span style='font-size:14.0pt'>Select the Instrument |
---|
1879 | Parameter tree item, select the refinement flag for U, V, W, X, Y and SH/L, |
---|
1880 | then select the Peak List tree entry again and use the Peak Fitting/<span |
---|
1881 | class=SpellE>Peakfit</span> menu command. The fit improves a bit, but since the |
---|
1882 | peak positions have not been refined, a good fit is not to be expected. Click |
---|
1883 | on the refine column heading to the immediate right of the peak positions, then |
---|
1884 | select ÒY – vary allÓ and again use the Peak Fitting/<span class=SpellE>Peakfit</span> |
---|
1885 | menu command. The fit improves significantly with an <span class=SpellE>Rwp</span> |
---|
1886 | value of ~8%. The fit shows very small difference plot:<o:p></o:p></span></p> |
---|
1887 | |
---|
1888 | <p class=MsoNormal><span style='font-size:14.0pt'><o:p> </o:p></span></p> |
---|
1889 | |
---|
1890 | <p class=MsoNormal><span style='font-size:14.0pt;mso-fareast-language:EN-US; |
---|
1891 | mso-no-proof:yes'><!--[if gte vml 1]><v:shape id="_x0000_i1074" type="#_x0000_t75" |
---|
1892 | style='width:348pt;height:247pt;visibility:visible;mso-wrap-style:square'> |
---|
1893 | <v:imagedata src="FindProfParamCW_files/image095.png" o:title=""/> |
---|
1894 | </v:shape><![endif]--><![if !vml]><img border=0 width=350 height=249 |
---|
1895 | src="FindProfParamCW_files/image096.png" v:shapes="_x0000_i1074"><![endif]></span><span |
---|
1896 | style='font-size:14.0pt'><span style="mso-spacerun:yes"> </span><o:p></o:p></span></p> |
---|
1897 | |
---|
1898 | <p class=MsoNormal><span style='font-size:14.0pt'>However, pressing the w key |
---|
1899 | in the plot window changes the plot appearance and it can be seen that the fit |
---|
1900 | at low angle is significantly worse than at high angle. This suggests that log |
---|
1901 | angle asymmetry may not be well fit. <o:p></o:p></span></p> |
---|
1902 | |
---|
1903 | <p class=MsoNormal><span style='font-size:14.0pt;mso-fareast-language:EN-US; |
---|
1904 | mso-no-proof:yes'><!--[if gte vml 1]><v:shape id="_x0000_i1073" type="#_x0000_t75" |
---|
1905 | style='width:338pt;height:232pt;visibility:visible;mso-wrap-style:square'> |
---|
1906 | <v:imagedata src="FindProfParamCW_files/image097.png" o:title=""/> |
---|
1907 | </v:shape><![endif]--><![if !vml]><img border=0 width=340 height=234 |
---|
1908 | src="FindProfParamCW_files/image098.png" v:shapes="_x0000_i1073"><![endif]></span><span |
---|
1909 | style='font-size:14.0pt'><o:p></o:p></span></p> |
---|
1910 | |
---|
1911 | <p class=MsoNormal><span style='font-size:14.0pt'>To improve this, we can force |
---|
1912 | the SH/L value to be larger. Instead of the local minimum that was found with |
---|
1913 | SH/L of ~0.003, we can select the Instrument Parameter tree item and set SH/L |
---|
1914 | to a larger value, say 0.03. Then select the Peak List tree entry again and use |
---|
1915 | the Peak Fitting/<span class=SpellE>Peakfit</span> menu command. <span |
---|
1916 | class=GramE>The<span style="mso-spacerun:yes"> </span><span class=SpellE>Rwp</span></span> |
---|
1917 | improves somewhat, to circa 5%, but now the difference plot is greatly improved |
---|
1918 | at low angle with SH/L increasing to 0.063:<o:p></o:p></span></p> |
---|
1919 | |
---|
1920 | <p class=MsoNormal><span style='font-size:14.0pt;mso-fareast-language:EN-US; |
---|
1921 | mso-no-proof:yes'><!--[if gte vml 1]><v:shape id="Picture_x0020_50" o:spid="_x0000_i1072" |
---|
1922 | type="#_x0000_t75" style='width:344pt;height:241pt;visibility:visible; |
---|
1923 | mso-wrap-style:square'> |
---|
1924 | <v:imagedata src="FindProfParamCW_files/image099.png" o:title=""/> |
---|
1925 | </v:shape><![endif]--><![if !vml]><img border=0 width=346 height=243 |
---|
1926 | src="FindProfParamCW_files/image100.png" v:shapes="Picture_x0020_50"><![endif]></span><span |
---|
1927 | style='font-size:14.0pt'><o:p></o:p></span></p> |
---|
1928 | |
---|
1929 | <h3><span style='font-size:14.0pt;mso-bidi-font-family:"Times New Roman"'>Step |
---|
1930 | 3.4: Save Instrument Parameters<o:p></o:p></span></h3> |
---|
1931 | |
---|
1932 | <p class=MsoNormal><span style='font-size:14.0pt'><o:p> </o:p></span></p> |
---|
1933 | |
---|
1934 | <p class=MsoNormal><span style='font-size:14.0pt'>Select the Instrument |
---|
1935 | Parameter tree entry and then use the Operations/Save ProfileÉ menu command to |
---|
1936 | write a file. This can be used as the starting point for future refinements. |
---|
1937 | The plot shown at this point compares the mostly meaningless default starting |
---|
1938 | profile terms (as solid lines) to the fit here (as dashed lines). Using Operations/Load |
---|
1939 | ProfileÉ resets the default values to the current refinement parameters, which |
---|
1940 | makes for a simpler plot. <o:p></o:p></span></p> |
---|
1941 | |
---|
1942 | <h3><span style='font-size:14.0pt;mso-bidi-font-family:"Times New Roman"'>Step |
---|
1943 | 3.5: Compare individual peaks widths to fit profile<o:p></o:p></span></h3> |
---|
1944 | |
---|
1945 | <p class=MsoNormal><span style='font-size:14.0pt'><o:p> </o:p></span></p> |
---|
1946 | |
---|
1947 | <p class=MsoNormal><span style='font-size:14.0pt'>While the Instrument |
---|
1948 | Parameter tree entry is selected, turn off refinement of the U, V, W X, and Y refinement |
---|
1949 | flags (SH/L can be left to continue to refine) and then select the Peak List |
---|
1950 | tree entry. <span style="mso-spacerun:yes"> </span>Double-click on the |
---|
1951 | refine headings for the sigma and gamma columns to refine the individual peak widths |
---|
1952 | and again and use the Peak Fitting/<span class=SpellE>Peakfit</span> menu |
---|
1953 | command. The fit quality does not change very significantly, and selecting the Instrument |
---|
1954 | Parameter tree entry generates a plot that shows that the individual peak fits |
---|
1955 | are quite close to the fitted curves. <o:p></o:p></span></p> |
---|
1956 | |
---|
1957 | <p class=MsoNormal><span style='font-size:14.0pt'><o:p> </o:p></span></p> |
---|
1958 | |
---|
1959 | <p class=MsoNormal><span style='font-size:14.0pt;mso-fareast-language:EN-US; |
---|
1960 | mso-no-proof:yes'><!--[if gte vml 1]><v:shape id="Picture_x0020_51" o:spid="_x0000_i1071" |
---|
1961 | type="#_x0000_t75" style='width:330pt;height:236pt;visibility:visible; |
---|
1962 | mso-wrap-style:square'> |
---|
1963 | <v:imagedata src="FindProfParamCW_files/image101.png" o:title=""/> |
---|
1964 | </v:shape><![endif]--><![if !vml]><img border=0 width=332 height=238 |
---|
1965 | src="FindProfParamCW_files/image102.png" v:shapes="Picture_x0020_51"><![endif]></span><span |
---|
1966 | style='font-size:14.0pt'><o:p></o:p></span></p> |
---|
1967 | |
---|
1968 | </div> |
---|
1969 | |
---|
1970 | </body> |
---|
1971 | |
---|
1972 | </html> |
---|