Changeset 1258
- Timestamp:
- Mar 20, 2014 4:34:09 PM (10 years ago)
- Location:
- trunk/help
- Files:
-
- 19 added
- 2 edited
Legend:
- Unmodified
- Added
- Removed
-
trunk/help/gsasII.html
r1197 r1258 25 25 <o:Author>Von Dreele</o:Author> 26 26 <o:LastAuthor>Von Dreele</o:LastAuthor> 27 <o:Revision>13 4</o:Revision>28 <o:TotalTime>397 5</o:TotalTime>27 <o:Revision>135</o:Revision> 28 <o:TotalTime>3979</o:TotalTime> 29 29 <o:Created>2011-11-28T16:49:00Z</o:Created> 30 <o:LastSaved>2014-0 1-13T19:41:00Z</o:LastSaved>30 <o:LastSaved>2014-03-20T17:00:00Z</o:LastSaved> 31 31 <o:Pages>27</o:Pages> 32 <o:Words>10 790</o:Words>33 <o:Characters>615 03</o:Characters>32 <o:Words>10804</o:Words> 33 <o:Characters>61589</o:Characters> 34 34 <o:Company>Argonne National Laboratory</o:Company> 35 <o:Lines>51 2</o:Lines>35 <o:Lines>513</o:Lines> 36 36 <o:Paragraphs>144</o:Paragraphs> 37 <o:CharactersWithSpaces>72 149</o:CharactersWithSpaces>37 <o:CharactersWithSpaces>72249</o:CharactersWithSpaces> 38 38 <o:Version>14.00</o:Version> 39 39 </o:DocumentProperties> … … 2342 2342 style='font-weight:normal'>2-D Image integration</span></a><o:p></o:p></strong></p> 2343 2343 2344 <p class=MsoNormal><strong><a href="Strain%20fitting%20of%202D%20data%20in%20GSAS-II.htm"><span 2344 <p class=MsoNormal><strong><a 2345 href="Strain%20fitting%20of%202D%20data%20in%20GSAS-II.htm"><span 2345 2346 style='font-weight:normal'>2-D Strain data fitting</span></a><o:p></o:p></strong></p> 2346 2347 … … 2351 2352 class=SpellE><span style='font-weight:normal'>jadarite</span></span></a> & <a 2352 2353 href="Charge%20Flipping%20-%20sucrose.htm"><span style='font-weight:normal'>sucrose</span></a><o:p></o:p></strong></p> 2354 2355 <p class=MsoNormal><strong><span style='font-weight:normal;mso-bidi-font-weight: 2356 bold'><a href="Small%20Angle%20Size%20Distribution.htm"><span style='mso-bidi-font-weight: 2357 normal'>Small angle X-ray data size distribution</span></a><o:p></o:p></span></strong></p> 2353 2358 2354 2359 <p class=MsoNormal><strong><o:p> </o:p></strong></p> … … 2379 2384 Parameters"</a> item under a ‘PWDR’ entry contains information 2380 2385 about how data were collected, such as the sample temperature <a 2381 href="#Sample_Parameters">(see below)</a>. The arrow keys (up & down) move the2382 selection to successive entries in the data tree; both the data window and the 2383 associated plot (if any) will change.<o:p></o:p></span></p>2386 href="#Sample_Parameters">(see below)</a>. The arrow keys (up & down) move 2387 the selection to successive entries in the data tree; both the data window and 2388 the associated plot (if any) will change.<o:p></o:p></span></p> 2384 2389 2385 2390 <h4><span style='mso-fareast-font-family:"Times New Roman"'>What can I do here?<o:p></o:p></span></h4> … … 2588 2593 ‘<b style='mso-bidi-font-weight:normal'>Import</b>’ – A sub 2589 2594 menu appears with choices for import of data. Each entry when selected with the 2590 mouse shows further submenus with specific imports that are available. Any of 2591 thesefiles can be accessed from a zip file.</p>2595 mouse shows further submenus with specific imports that are available. Any of these 2596 files can be accessed from a zip file.</p> 2592 2597 2593 2598 <p class=MsoListParagraphCxSpMiddle style='margin-left:1.0in;mso-add-space: … … 2602 2607 style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span 2603 2608 class=GramE><b style='mso-bidi-font-weight:normal'>from</b></span><b 2604 style='mso-bidi-font-weight:normal'> GSAS .EXP file - </b>This reads one phase from2605 a GSAS experiment file (name.EXP). The file name is found in a directory2609 style='mso-bidi-font-weight:normal'> GSAS .EXP file - </b>This reads one phase 2610 from a GSAS experiment file (name.EXP). The file name is found in a directory 2606 2611 dialog; you can change directories as needed. Only .EXP (or .exp) file names 2607 2612 are shown. If the selected file has more than one phase, a dialog is shown with … … 2750 2755 normal'>from</b></span><b style='mso-bidi-font-weight:normal'> F**2 HKL file </b>This 2751 2756 reads structure factors (as F**2) and sig(F**2) from a SHELX format .<span 2752 class=SpellE>hkl</span> file. The file names are found in a directory dialog; you2753 can change directories as needed. You must know this is the content of this2757 class=SpellE>hkl</span> file. The file names are found in a directory dialog; 2758 you can change directories as needed. You must know this is the content of this 2754 2759 file as it will have no internal indication of its contents.<b 2755 2760 style='mso-bidi-font-weight:normal'><o:p></o:p></b></p> … … 2914 2919 style='mso-fareast-font-family:"Times New Roman"'><span style='mso-list:Ignore'>2.<span 2915 2920 style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span 2916 style='mso-fareast-font-family:"Times New Roman"'>Select ‘Min 2917 delta-M/M’ for convergence; the refinement will stop when the change in 2918 the minimization function is less than this value. Set Min delta-M/M = 1.0 to 2919 force just a single cycle to be performed. A value less than 10<sup>-4</sup> 2920 (the default) generally gives no better result. The allowed range is 10<sup>-9</sup> 2921 to 1.0.<o:p></o:p></span></p> 2921 style='mso-fareast-font-family:"Times New Roman"'>Select ‘Min delta-M/M’ 2922 for convergence; the refinement will stop when the change in the minimization 2923 function is less than this value. Set Min delta-M/M = 1.0 to force just a 2924 single cycle to be performed. A value less than 10<sup>-4</sup> (the default) 2925 generally gives no better result. The allowed range is 10<sup>-9</sup> to 1.0.<o:p></o:p></span></p> 2922 2926 2923 2927 <p class=MsoListParagraphCxSpMiddle style='text-indent:-.25in;mso-list:l18 level1 lfo2'><![if !supportLists]><span … … 2937 2941 style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span 2938 2942 style='mso-fareast-font-family:"Times New Roman"'>If ‘analytic 2939 Hessian’ is chosen then select ‘Max cycles’, the maximum 2940 number of least squares cycles to be performed. Least squares cycles are 2941 determined by the number of times a new Hessian matrix is computes; the <span 2942 class=SpellE>Levenberg</span>-Marquardt algorithm may compute the function 2943 several times between cycles as it finds the optimal value of the Marquardt 2944 coefficient. Choices are given in the pull down selection; the default is 3 2945 cycles.<o:p></o:p></span></p> 2943 Hessian’ is chosen then select ‘Max cycles’, the maximum number 2944 of least squares cycles to be performed. Least squares cycles are determined by 2945 the number of times a new Hessian matrix is computes; the <span class=SpellE>Levenberg</span>-Marquardt 2946 algorithm may compute the function several times between cycles as it finds the 2947 optimal value of the Marquardt coefficient. Choices are given in the pull down 2948 selection; the default is 3 cycles.<o:p></o:p></span></p> 2946 2949 2947 2950 <p class=MsoListParagraphCxSpLast style='text-indent:-.25in;mso-list:l18 level1 lfo2'><![if !supportLists]><span … … 3016 3019 – select a list of parameters that should have the same value (possibly 3017 3020 with a non-unitary multiplier for some). Examples are a list of atoms with the 3018 same thermal motion <span class=SpellE>Uiso</span>, sets of profile 3019 coefficients U<span class=GramE>,V,W</span> across multiple data sets. If 3020 selected, a dialog box will appear with a list of the available parameters. 3021 Select one and press OK; a second dialog box will appear with only those3022 parameters that can be made equivalent to the first one. Choose those and press 3023 OK. Cancel in either dialog will cancel the operation. The equivalenced 3024 parameters will show as an equation of the form M<sub>1</sub>*P<sub>1</sub>+M<sub>2</sub>*P<sub>2</sub>=0; 3025 usually M1=1.0 and M2=-1.0, but can be changed via the ‘Edit’ 3026 button. The keyword ‘EQUIV’ marks it as <span class=GramE>an 3027 equivalence</span>.A Delete button can be used to remove it.<o:p></o:p></span></p>3021 same thermal motion <span class=SpellE>Uiso</span>, sets of profile coefficients 3022 U<span class=GramE>,V,W</span> across multiple data sets. If selected, a dialog 3023 box will appear with a list of the available parameters. Select one and press 3024 OK; a second dialog box will appear with only those parameters that can be made 3025 equivalent to the first one. Choose those and press OK. Cancel in either dialog 3026 will cancel the operation. The equivalenced parameters will show as an equation 3027 of the form M<sub>1</sub>*P<sub>1</sub>+M<sub>2</sub>*P<sub>2</sub>=0; usually 3028 M1=1.0 and M2=-1.0, but can be changed via the ‘Edit’ button. The 3029 keyword ‘EQUIV’ marks it as <span class=GramE>an equivalence</span>. 3030 A Delete button can be used to remove it.<o:p></o:p></span></p> 3028 3031 3029 3032 <p class=MsoListParagraphCxSpMiddle style='margin-left:1.0in;mso-add-space: … … 3093 3096 style='mso-fareast-font-family:"Times New Roman"'><span style='mso-list:Ignore'>4.<span 3094 3097 style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span 3095 style='mso-fareast-font-family:"Times New Roman"'>You can change the search 3096 rangeused to find the bonds/angles that meet your criteria for restraint.<o:p></o:p></span></p>3098 style='mso-fareast-font-family:"Times New Roman"'>You can change the search range 3099 used to find the bonds/angles that meet your criteria for restraint.<o:p></o:p></span></p> 3097 3100 3098 3101 <p class=MsoListParagraphCxSpMiddle style='text-indent:-.25in;mso-list:l12 level1 lfo4'><![if !supportLists]><span … … 3191 3194 style='mso-bidi-font-weight:normal'><span style='mso-fareast-font-family:"Times New Roman"'>Delete 3192 3195 restraints</span></b><span style='mso-fareast-font-family:"Times New Roman"'> 3193 – this deletes selected restraints from the list. A single click in the blank 3194 box in the upper left corner of the table will select/deselect all restraints.<o:p></o:p></span></p> 3196 – this deletes selected restraints from the list. A single click in the 3197 blank box in the upper left corner of the table will select/deselect all 3198 restraints.<o:p></o:p></span></p> 3195 3199 3196 3200 <h4><a name="Rigid_bodies"><span style='mso-fareast-font-family:"Times New Roman"'>Rigid … … 3229 3233 </span></span></span></b><![endif]><b style='mso-bidi-font-weight:normal'><span 3230 3234 style='mso-fareast-font-family:"Times New Roman"'>Add rigid body</span></b><span 3231 style='mso-fareast-font-family:"Times New Roman"'> – (Vector rigid 3232 bodies) this creates a vector description of a rigid body. A dialog box asks 3233 the number of atoms (>2) and the number of vectors required to create the 3234 rigid body. An entry will be created showing a magnitude with the vector set to 3235 be applied for each vector needed to develop the rigid body.<b 3236 style='mso-bidi-font-weight:normal'><o:p></o:p></b></span></p>3235 style='mso-fareast-font-family:"Times New Roman"'> – (Vector rigid bodies) 3236 this creates a vector description of a rigid body. A dialog box asks the number 3237 of atoms (>2) and the number of vectors required to create the rigid body. 3238 An entry will be created showing a magnitude with the vector set to be applied 3239 for each vector needed to develop the rigid body.<b style='mso-bidi-font-weight: 3240 normal'><o:p></o:p></b></span></p> 3237 3241 3238 3242 <p class=MsoListParagraphCxSpMiddle style='margin-left:1.0in;mso-add-space: … … 3330 3334 style='mso-fareast-font-family:"Times New Roman";color:windowtext;font-weight: 3331 3335 normal;mso-bidi-font-weight:bold'> – this will create a text file of 3332 selected columns with values and corresponding <span class=SpellE>esds</span>. 3333 Afile dialog box will appear; give a suitable file name; you may change3336 selected columns with values and corresponding <span class=SpellE>esds</span>. A 3337 file dialog box will appear; give a suitable file name; you may change 3334 3338 directory if desired.<o:p></o:p></span></h5> 3335 3339 … … 3338 3342 <p class=MsoNormal>These are shown in the data tree with a prefix of 3339 3343 ‘PWDR’, ’HKLF’, ‘IMG’, or ‘PDF’ 3340 and usually a file name. These constitute the data sets 3341 (‘Histograms’) to be used by GSAS-II for analysis. Selection of 3342 these items does not produce any information in the data window but does3343 display the data in the PlotsWindow. They are described below.</p>3344 and usually a file name. These constitute the data sets (‘Histograms’) 3345 to be used by GSAS-II for analysis. Selection of these items does not produce 3346 any information in the data window but does display the data in the Plots 3347 Window. They are described below.</p> 3344 3348 3345 3349 <h3><a name="PWD_Analysis"></a>Powder Histograms - PWDR</h3> … … 3665 3669 style='mso-fareast-font-family:"Times New Roman"'> – this copies the 3666 3670 instrument parameters shown to other selected powder patterns. If used, a 3667 dialog box (Copy parameters) will appear showing the list of available powder 3668 patterns, you can copy the instrument parameters to any or all of them; select ‘All’ 3669 to copy them to all patterns. Then select ‘OK’ to do the copy; 3670 ‘Cancel’ to cancel the operation. The copy will only work for 3671 instrument parameters that are commensurate with the one that is shown, e.g. 3672 s ingle radiation patterns will not be updated from K</span><sub><span3671 dialog box (Copy parameters) will appear showing the list of available powder patterns, 3672 you can copy the instrument parameters to any or all of them; select 3673 ‘All’ to copy them to all patterns. Then select ‘OK’ to 3674 do the copy; ‘Cancel’ to cancel the operation. The copy will only 3675 work for instrument parameters that are commensurate with the one that is 3676 shown, e.g. single radiation patterns will not be updated from K</span><sub><span 3673 3677 style='font-family:Symbol;mso-fareast-font-family:"Times New Roman"'>a</span></sub><sub><span 3674 3678 style='mso-fareast-font-family:"Times New Roman"'>1</span></sub><span … … 3689 3693 style='mso-fareast-font-family:"Times New Roman"'>- – this copies the 3690 3694 instrument parameter refinement flags shown to other selected powder patterns. 3691 If used, a dialog box (Copy refinement flags) will appear showing the list of available 3692 powder patterns, you can copy the instrument parameter refinement flags to any 3693 or all of them; select ‘All’ to copy them to all patterns. Then 3694 select ‘OK’ to do the copy; ‘Cancel’ to cancel the 3695 operation. The copy will only work for instrument parameters that are 3696 commensurate with the one that is shown, e.g. single radiation patterns will 3697 not be updated from K</span><sub><span style='font-family:Symbol;mso-fareast-font-family: 3698 "Times New Roman"'>a</span></sub><sub><span style='mso-fareast-font-family: 3699 "Times New Roman"'>1</span></sub><span style='mso-fareast-font-family:"Times New Roman"'>/K</span><sub><span 3695 If used, a dialog box (Copy refinement flags) will appear showing the list of 3696 available powder patterns, you can copy the instrument parameter refinement 3697 flags to any or all of them; select ‘All’ to copy them to all 3698 patterns. Then select ‘OK’ to do the copy; ‘Cancel’ to 3699 cancel the operation. The copy will only work for instrument parameters that 3700 are commensurate with the one that is shown, e.g. single radiation patterns 3701 will not be updated from K</span><sub><span style='font-family:Symbol; 3702 mso-fareast-font-family:"Times New Roman"'>a</span></sub><sub><span 3703 style='mso-fareast-font-family:"Times New Roman"'>1</span></sub><span 3704 style='mso-fareast-font-family:"Times New Roman"'>/K</span><sub><span 3700 3705 style='font-family:Symbol;mso-fareast-font-family:"Times New Roman"'>a</span></sub><sub><span 3701 3706 style='mso-fareast-font-family:"Times New Roman"'>2</span></sub><span … … 3866 3871 color:windowtext;font-weight:normal;mso-bidi-font-weight:bold'> – this 3867 3872 fills the table with peak positions. These are selected based on peak tops that 3868 are substantially above background. Noisy data will give spurious peaks and small3869 peaks or shoulders will not be found. Examine results & modify as needed.<span 3870 class=MsoHyperlink><span style='color:windowtext;text-decoration:none; 3871 text-underline:none'><o:p></o:p></span></span></span></span></h5>3873 are substantially above background. Noisy data will give spurious peaks and 3874 small peaks or shoulders will not be found. Examine results & modify as 3875 needed.<span class=MsoHyperlink><span style='color:windowtext;text-decoration: 3876 none;text-underline:none'><o:p></o:p></span></span></span></span></h5> 3872 3877 3873 3878 <h5 style='margin-left:1.0in;text-indent:-.25in;mso-list:l11 level2 lfo15; … … 3900 3905 The refinement will proceed until convergence. We suggest you vary the 3901 3906 intensity along with the background first (the default), then vary the position 3902 and instrument parameters after. The order will depend on how poor is the initial3903 estimate of the instrument parameters (U, V, W, X, Y & SH/L). To determine 3904 how to proceed, examine in detail the powder pattern difference curve displayed 3905 in the GSASII Plots window. If individual peaks show peak widths that are 3906 widely different, their individual sigma and gamma parameters may be refined. 3907 If the refinement results in negative peak coefficients, these will be3907 and instrument parameters after. The order will depend on how poor is the 3908 initial estimate of the instrument parameters (U, V, W, X, Y & SH/L). To 3909 determine how to proceed, examine in detail the powder pattern difference curve 3910 displayed in the GSASII Plots window. If individual peaks show peak widths that 3911 are widely different, their individual sigma and gamma parameters may be 3912 refined. If the refinement results in negative peak coefficients, these will be 3908 3913 highlighted in red. If this happens, you should </span></span><span 3909 3914 style='mso-bookmark:Index_Peaks'><span style='mso-fareast-font-family:"Times New Roman"; … … 3920 3925 none;text-underline:none'><span style='mso-list:Ignore'>d.<span 3921 3926 style='font:7.0pt "Times New Roman"'> </span></span></span></span><![endif]><span 3922 style='mso-fareast-font-family:"Times New Roman";color:windowtext'>LSQ one cycle3923 </span></span><span style='mso-bookmark:Index_Peaks'><span style='mso-fareast-font-family: 3924 "Times New Roman";color:windowtext;font-weight:normal;mso-bidi-font-weight:3925 bold'>– perform a single cycle of least squares refinement. This can be 3926 used in difficult cases to get a refinement started toward convergence.<span 3927 class=MsoHyperlink><span style='color:windowtext;text-decoration:none;3928 text- underline:none'><o:p></o:p></span></span></span></span></h5>3927 style='mso-fareast-font-family:"Times New Roman";color:windowtext'>LSQ one 3928 cycle </span></span><span style='mso-bookmark:Index_Peaks'><span 3929 style='mso-fareast-font-family:"Times New Roman";color:windowtext;font-weight: 3930 normal;mso-bidi-font-weight:bold'>– perform a single cycle of least 3931 squares refinement. This can be used in difficult cases to get a refinement 3932 started toward convergence.<span class=MsoHyperlink><span style='color:windowtext; 3933 text-decoration:none;text-underline:none'><o:p></o:p></span></span></span></span></h5> 3929 3934 3930 3935 <h5 style='margin-left:1.0in;text-indent:-.25in;mso-list:l11 level2 lfo15; … … 4159 4164 style='mso-fareast-font-family:"Times New Roman"'>Max <span class=SpellE>Nc</span>/Nobs 4160 4165 </span></b></span><span style='mso-bookmark:Reflection_List'><span 4161 style='mso-fareast-font-family:"Times New Roman"'>– this controls the 4162 extent of the search for the correct indexing. This may need to be increased if 4163 anindexing trial terminates too quickly. It rarely needs to be changed.<span4166 style='mso-fareast-font-family:"Times New Roman"'>– this controls the extent 4167 of the search for the correct indexing. This may need to be increased if an 4168 indexing trial terminates too quickly. It rarely needs to be changed.<span 4164 4169 class=MsoHyperlink><span style='color:windowtext;text-decoration:none; 4165 4170 text-underline:none'><o:p></o:p></span></span></span></span></p> … … 4197 4202 style='mso-bidi-font-weight:normal'><span style='mso-fareast-font-family:"Times New Roman"'>Index 4198 4203 Cell</span></b></span><span style='mso-bookmark:Reflection_List'><span 4199 style='mso-fareast-font-family:"Times New Roman"'> – this starts the indexing4200 process. Output will appear on the console and a progress bar dialog will 4201 appear which tracks trial volume. A <b style='mso-bidi-font-weight:normal'>Cancel</b>4204 style='mso-fareast-font-family:"Times New Roman"'> – this starts the 4205 indexing process. Output will appear on the console and a progress bar dialog 4206 will appear which tracks trial volume. A <b style='mso-bidi-font-weight:normal'>Cancel</b> 4202 4207 button will terminate indexing; it may need to be pressed more than once to 4203 4208 fully terminate the indexing process. Console output shows possible solutions … … 4250 4255 style='mso-bidi-font-weight:normal'><span style='mso-fareast-font-family:"Times New Roman"'>Make 4251 4256 new phase</span></b></span><span style='mso-bookmark:Reflection_List'><span 4252 style='mso-fareast-font-family:"Times New Roman"'> – this creates a new phase4253 from the selected unit cell and chosen space group. A dialog box will appear 4254 a sking for a name for this phase. See the new entry under Phases and the new4255 lattice parameters will be in the </span></span><a href="#General"><span4257 style='mso-fareast-font-family:"Times New Roman"'> – this creates a new 4258 phase from the selected unit cell and chosen space group. A dialog box will 4259 appear asking for a name for this phase. See the new entry under Phases and the 4260 new lattice parameters will be in the </span></span><a href="#General"><span 4256 4261 style='mso-bookmark:Reflection_List'><span style='mso-fareast-font-family:"Times New Roman"; 4257 4262 color:windowtext;text-decoration:none;text-underline:none'>General</span></span><span … … 4417 4422 4418 4423 <p class=MsoNormal>This window shows whatever comment lines found in a 4419 “metadata” file when the image data file was read by GSAS-II. If you4420 are lucky, there will be useful information here (e.g. sample name, date4424 “metadata” file when the image data file was read by GSAS-II. If 4425 you are lucky, there will be useful information here (e.g. sample name, date 4421 4426 collected, wavelength used, etc.). If not, this window will be blank. The text 4422 4427 is read-only.</p> … … 4564 4569 style='mso-fareast-font-family:"Times New Roman"'>Phase type – </span></b><span 4565 4570 style='mso-fareast-font-family:"Times New Roman"'>this can only be set when 4566 there are no atoms in the Atoms page for this phase. Select it when the phase 4567 i s initialized.<span class=MsoHyperlink><span style='color:windowtext'><o:p></o:p></span></span></span></p>4571 there are no atoms in the Atoms page for this phase. Select it when the phase is 4572 initialized.<span class=MsoHyperlink><span style='color:windowtext'><o:p></o:p></span></span></span></p> 4568 4573 4569 4574 <p class=MsoListParagraphCxSpMiddle style='margin-left:1.0in;mso-add-space: … … 4574 4579 </span></span></span></span><![endif]><b style='mso-bidi-font-weight:normal'><span 4575 4580 style='mso-fareast-font-family:"Times New Roman"'>Space group</span></b><span 4576 style='mso-fareast-font-family:"Times New Roman"'> – this should be set when4577 the phase is initialized; it can be changed later. Be careful about the impact 4578 on Atom site symmetry and multiplicity if you do. GSAS-II will recognize any 4579 legal space group symbol using the short Hermann-Mauguin forms; put a space4581 style='mso-fareast-font-family:"Times New Roman"'> – this should be set 4582 when the phase is initialized; it can be changed later. Be careful about the 4583 impact on Atom site symmetry and multiplicity if you do. GSAS-II will recognize 4584 any legal space group symbol using the short Hermann-Mauguin forms; put a space 4580 4585 between the axial fields (e.g. ‘F d 3 m’ not ‘Fd3m’). 4581 4586 For space groups with a choice of origin (e.g. F d 3 m), GSAS-II always uses … … 4707 4712 style='mso-list:Ignore'>3.<span style='font:7.0pt "Times New Roman"'> 4708 4713 </span></span></span></span><![endif]><span style='mso-fareast-font-family: 4709 "Times New Roman"'>If there are entries in the Atoms page then the Elements table4710 is shown next on the General page; you may select the isotope (only relevant 4711 for neutron diffraction experiments). The density (just above the Elements) is 4712 computed depending on this choice, the unit cell volume and the atom 4713 fractions/site multiplicities in the entries on the Atoms page.<span4714 "Times New Roman"'>If there are entries in the Atoms page then the Elements 4715 table is shown next on the General page; you may select the isotope (only 4716 relevant for neutron diffraction experiments). The density (just above the 4717 Elements) is computed depending on this choice, the unit cell volume and the 4718 atom fractions/site multiplicities in the entries on the Atoms page.<span 4714 4719 class=MsoHyperlink><span style='color:windowtext'><o:p></o:p></span></span></span></p> 4715 4720 … … 4732 4737 to perform a Pawley refinement as opposed to a Rietveld refinement for this 4733 4738 phase. <b style='mso-bidi-font-weight:normal'>NB:</b> you probably should clear 4734 the <b style='mso-bidi-font-weight:normal'>Histogram scale factor</b> refinement 4735 flag (found in <b style='mso-bidi-font-weight:normal'>Sample parameters</b> for 4736 the powder data set) as it cannot be refined simultaneously with the Pawley 4737 reflection intensities.<span class=MsoHyperlink><span style='color:windowtext'><o:p></o:p></span></span></span></p> 4739 the <b style='mso-bidi-font-weight:normal'>Histogram scale factor</b> 4740 refinement flag (found in <b style='mso-bidi-font-weight:normal'>Sample 4741 parameters</b> for the powder data set) as it cannot be refined simultaneously 4742 with the Pawley reflection intensities.<span class=MsoHyperlink><span 4743 style='color:windowtext'><o:p></o:p></span></span></span></p> 4738 4744 4739 4745 <p class=MsoListParagraphCxSpMiddle style='margin-left:1.0in;mso-add-space: … … 4831 4837 class=GramE><b style='mso-bidi-font-weight:normal'><span style='mso-fareast-font-family: 4832 4838 "Times New Roman"'>k-Factor</span></b></span><span style='mso-fareast-font-family: 4833 "Times New Roman"'> – This is the threshold on the density map, all densities4834 below this are charge flipped.</span></p>4839 "Times New Roman"'> – This is the threshold on the density map, all 4840 densities below this are charge flipped.</span></p> 4835 4841 4836 4842 <p class=MsoListParagraphCxSpMiddle style='margin-left:1.0in;mso-add-space: … … 4885 4891 color:windowtext;text-decoration:none;text-underline:none'>MC/SA algorithm</span></b></span><span 4886 4892 class=MsoHyperlink><span style='mso-fareast-font-family:"Times New Roman"; 4887 color:windowtext;text-decoration:none;text-underline:none'> – This 4888 selectsthe type of jump to be used for each MC/SA trial.<o:p></o:p></span></span></p>4893 color:windowtext;text-decoration:none;text-underline:none'> – This selects 4894 the type of jump to be used for each MC/SA trial.<o:p></o:p></span></span></p> 4889 4895 4890 4896 <p class=MsoListParagraphCxSpMiddle style='margin-left:1.0in;mso-add-space: … … 4968 4974 </span></span></span></span><![endif]><b style='mso-bidi-font-weight:normal'><span 4969 4975 style='mso-fareast-font-family:"Times New Roman"'>Shift LMB</span></b><span 4970 style='mso-fareast-font-family:"Times New Roman"'> – on a row number selects4971 all atoms from last selection to the selected row (or top is none previously 4972 selected).<span class=MsoHyperlink><span style='color:windowtext;text-decoration: 4973 none;text-underline:none'><o:p></o:p></span></span></span></p>4976 style='mso-fareast-font-family:"Times New Roman"'> – on a row number 4977 selects all atoms from last selection to the selected row (or top is none 4978 previously selected).<span class=MsoHyperlink><span style='color:windowtext; 4979 text-decoration:none;text-underline:none'><o:p></o:p></span></span></span></p> 4974 4980 4975 4981 <p class=MsoListParagraphCxSpMiddle style='margin-left:1.0in;mso-add-space: … … 4992 4998 style='mso-fareast-font-family:"Times New Roman"'>Alt LMB</span></b><span 4993 4999 style='mso-fareast-font-family:"Times New Roman"'> – on a row number 4994 selects that atom for moving; the status line at bottom of window will show name4995 of atom selected. Use <b style='mso-bidi-font-weight:normal'>Alt LMB</b> again 4996 to select a target row for this atom; insertion will be before this row and the 4997 table will be updated to show the change. NB: the <b style='mso-bidi-font-weight:5000 selects that atom for moving; the status line at bottom of window will show 5001 name of atom selected. Use <b style='mso-bidi-font-weight:normal'>Alt LMB</b> 5002 again to select a target row for this atom; insertion will be before this row 5003 and the table will be updated to show the change. NB: the <b style='mso-bidi-font-weight: 4998 5004 normal'>Draw Atoms</b> list is not updated by this change.<span 4999 5005 class=MsoHyperlink><span style='color:windowtext;text-decoration:none; … … 5164 5170 style='mso-fareast-font-family:"Times New Roman"'><span style='mso-list:Ignore'>f.<span 5165 5171 style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><b 5166 style='mso-bidi-font-weight:normal'>Set atom refinement flags</b> – A 5167 popup dialog box appears; select refinement flags to apply to all selected 5168 atoms.</p> 5172 style='mso-bidi-font-weight:normal'>Set atom refinement flags</b> – A popup 5173 dialog box appears; select refinement flags to apply to all selected atoms.</p> 5169 5174 5170 5175 <p class=MsoListParagraphCxSpMiddle style='margin-left:1.0in;mso-add-space: … … 5240 5245 style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><b 5241 5246 style='mso-bidi-font-weight:normal'>Atom Selection from table</b>: select 5242 individual atoms by a left click of the mouse when pointed at the left most column5243 (atom numbers) of the atom display; hold down the Ctrl key to add to your 5244 selection; a previously selected atom will be deselected; hold down Shift key 5245 to select from last in list selected to current selection. A selected atom will 5246 be highlighted (in grey) and the atoms will be shown in green on the plot.5247 individual atoms by a left click of the mouse when pointed at the left most 5248 column (atom numbers) of the atom display; hold down the Ctrl key to add to 5249 your selection; a previously selected atom will be deselected; hold down Shift 5250 key to select from last in list selected to current selection. A selected atom 5251 will be highlighted (in grey) and the atoms will be shown in green on the plot. 5247 5252 Selection without the Ctrl key will clear previous selections. A double left 5248 5253 click in the (empty) upper left box will select or deselect all atoms.</p> … … 5387 5392 style='mso-fareast-font-family:"Times New Roman"'><span style='mso-list:Ignore'>a.<span 5388 5393 style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><b 5389 style='mso-bidi-font-weight:normal'>View pt. dist.</b> - this calculates 5390 distance from view point to all selected draw atoms; result is given on the5391 consolewindow.</p>5394 style='mso-bidi-font-weight:normal'>View pt. dist.</b> - this calculates distance 5395 from view point to all selected draw atoms; result is given on the console 5396 window.</p> 5392 5397 5393 5398 <p class=MsoListParagraphCxSpMiddle style='margin-left:1.0in;mso-add-space: … … 5459 5464 (magnitude, x y & z) of all peaks found within the unit cell from the last 5460 5465 Fourier/charge flip map search sorted in order of decreasing peak magnitude. 5461 The crystal structure plot shows each peak position as a white to dark gray 5462 cross; the shade is determined from the magnitude for the peak relative to the 5463 maximumpeak magnitude.</span></p>5466 The crystal structure plot shows each peak position as a white to dark gray cross; 5467 the shade is determined from the magnitude for the peak relative to the maximum 5468 peak magnitude.</span></p> 5464 5469 5465 5470 <h5><span style='mso-bookmark:Pawley'>What can I do here?</span></h5> … … 5469 5474 "Times New Roman"'><span style='mso-list:Ignore'>1.<span style='font:7.0pt "Times New Roman"'> 5470 5475 </span></span></span><![endif]><b style='mso-bidi-font-weight:normal'>Peak 5471 Selection from table</b>: select individual atoms by a left click of the mouse when5472 pointed at the left most column (atom numbers) of the atom display; hold down 5473 the Ctrl key to add to your selection; a previously selected atom will be5476 Selection from table</b>: select individual atoms by a left click of the mouse 5477 when pointed at the left most column (atom numbers) of the atom display; hold 5478 down the Ctrl key to add to your selection; a previously selected atom will be 5474 5479 deselected; hold down Shift key to select from last in list selected to current 5475 5480 selection. A selected atom will be highlighted (in grey) and the atoms will be … … 5579 5584 class=MsoHyperlink><span style='color:#4F81BD;mso-themecolor:accent1'><o:p></o:p></span></span></span></h4> 5580 5585 5581 <p class=MsoNormal><span style='mso-bookmark:Pawley'>This gives the list of 5582 reflections used in a Pawley refinement and can only be seen if the phase type 5583 is‘Pawley’ (see </span><a href="#General"><span style='mso-bookmark:5586 <p class=MsoNormal><span style='mso-bookmark:Pawley'>This gives the list of reflections 5587 used in a Pawley refinement and can only be seen if the phase type is 5588 ‘Pawley’ (see </span><a href="#General"><span style='mso-bookmark: 5584 5589 Pawley'><span style='color:windowtext;text-decoration:none;text-underline:none'>General</span></span></a><span 5585 5590 style='mso-bookmark:Pawley'>).</span></p> … … 5629 5634 clicking on the box or by selecting one and then selecting the column (a single 5630 5635 click on the column heading). Then type ‘y’ to set the refine flags 5631 or ‘n’ to clear the flags. You should deselect those reflections that5632 fall below the lower limit or above the upper limit of the powder pattern5636 or ‘n’ to clear the flags. You should deselect those reflections 5637 that fall below the lower limit or above the upper limit of the powder pattern 5633 5638 otherwise you may have a singular matrix error in your Pawley refinement.</span></p> 5634 5639 … … 5669 5674 5670 5675 <p class=MsoNormal align=center style='text-align:center'><span 5676 style='mso-bookmark:Pawley'><o:p> </o:p></span></p> 5677 5678 <p class=MsoNormal align=center style='text-align:center'><span 5671 5679 style='mso-bookmark:Pawley'><span class=MsoHyperlink><span style='color:windowtext; 5672 5680 text-decoration:none;text-underline:none'><o:p> </o:p></span></span></span></p> … … 5685 5693 5686 5694 </span></span></a></div> 5695 5696 <p class=MsoNormal align=center style='text-align:center'><span 5697 style='mso-bookmark:Pawley'><o:p> </o:p></span></p> 5687 5698 5688 5699 <p class=MsoNormal align=center style='text-align:center'><span … … 5822 5833 none;text-underline:none'><span style='mso-list:Ignore'>1.<span 5823 5834 style='font:7.0pt "Times New Roman"'> </span></span></span></span><![endif]><span 5824 style='mso-fareast-font-family:"Times New Roman"'>Move the mouse cursor across 5825 theplot, the plot status line will show the cursor position in 2</span></span><span5835 style='mso-fareast-font-family:"Times New Roman"'>Move the mouse cursor across the 5836 plot, the plot status line will show the cursor position in 2</span></span><span 5826 5837 style='mso-bookmark:Pawley'><span style='font-family:Symbol;mso-fareast-font-family: 5827 5838 "Times New Roman"'>Q</span></span><span style='mso-bookmark:Pawley'><span … … 5863 5874 "Times New Roman"'><span style='mso-list:Ignore'>c.<span style='font:7.0pt "Times New Roman"'> 5864 5875 </span></span></span><![endif]><span class=GramE><b style='mso-bidi-font-weight: 5865 normal'>d</b></span><b style='mso-bidi-font-weight:normal'>: offset down</b> - for5866 a waterfall plot of multiple powder profiles, increase the offset down. Does 5867 not apply if only one pattern.</span></p>5876 normal'>d</b></span><b style='mso-bidi-font-weight:normal'>: offset down</b> - 5877 for a waterfall plot of multiple powder profiles, increase the offset down. 5878 Does not apply if only one pattern.</span></p> 5868 5879 5869 5880 <p class=MsoListParagraphCxSpMiddle style='margin-left:1.0in;mso-add-space: … … 5873 5884 </span></span></span><![endif]><span class=GramE><b style='mso-bidi-font-weight: 5874 5885 normal'>u</b></span><b style='mso-bidi-font-weight:normal'>: offset up</b> - 5875 for a waterfall plot of multiple powder profiles, increase the offset up. Does 5876 notapply if only one pattern.</span></p>5886 for a waterfall plot of multiple powder profiles, increase the offset up. Does not 5887 apply if only one pattern.</span></p> 5877 5888 5878 5889 <p class=MsoListParagraphCxSpMiddle style='margin-left:1.0in;mso-add-space: … … 6020 6031 style='mso-bidi-font-weight:normal'><span style='mso-fareast-font-family:"Times New Roman"'>: 6021 6032 contour off/on</span></b></span><span style='mso-bookmark:Pawley'><span 6022 style='mso-fareast-font-family:"Times New Roman"'> – this turns off 6023 contouringand returns to a waterfall plot with any offsets applied.<span6033 style='mso-fareast-font-family:"Times New Roman"'> – this turns off contouring 6034 and returns to a waterfall plot with any offsets applied.<span 6024 6035 class=MsoHyperlink><span style='color:windowtext;text-decoration:none; 6025 6036 text-underline:none'><o:p></o:p></span></span></span></span></p> … … 6245 6256 none'><o:p></o:p></span></span></span></span></h4> 6246 6257 6247 <p class=MsoNormal><span style='mso-bookmark:Pawley'>This plot shows the atoms 6248 ofthe crystal structure. The atoms are displayed according to the controls in the6258 <p class=MsoNormal><span style='mso-bookmark:Pawley'>This plot shows the atoms of 6259 the crystal structure. The atoms are displayed according to the controls in the 6249 6260 </span><a href="gsasII.html"><span style='mso-bookmark:Pawley'><span 6250 6261 style='color:windowtext;text-decoration:none;text-underline:none'>Draw Options</span></span></a><span … … 6268 6279 6269 6280 </span></span></a></div> 6281 6282 <p class=MsoNormal align=center style='text-align:center'><span 6283 style='mso-bookmark:Pawley'><o:p> </o:p></span></p> 6270 6284 6271 6285 <p class=MsoNormal align=center style='text-align:center'><span -
trunk/help/gsasII_files/props011.xml
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