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| 2 | <head> |
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| 3 | <title>EXPGUI</title> |
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| 4 | <meta name="keywords" content="crystallography, Rietveld, diffraction, |
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| 5 | GSAS, EXPGUI"> |
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| 6 | </HEAD> |
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| 7 | <style> |
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| 8 | A:link {text-decoration:none} |
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| 9 | A:vlink {text-decoration:none} |
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| 10 | </style> |
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| 11 | |
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| 12 | <BODY BGCOLOR="#FFFFFF" |
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| 13 | topmargin="0" leftmargin="0" marginwidth="0" marginheight="0" |
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| 14 | text="#000000" link="#0033ff" vlink="#0033ff" alink="#0033ff"> |
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| 15 | |
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| 16 | <? |
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| 17 | include("/var/www/include/navigation.inc"); |
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| 18 | include("/var/www/include/utility.inc"); |
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| 19 | ?> |
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| 20 | <blockquote><font face="arial, helvetica, sans-serif"> |
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| 21 | |
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| 22 | <TABLE BORDER BGCOLOR="#FFFF40" ALIGN=RIGHT> |
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| 23 | <TR><TH><A Href="expgui.html">EXPGUI top</A> |
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| 24 | </TH><TH><A Href="expgui6.html">Next page</A> |
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| 25 | </TH><TH><A Href="expgui4.html">Previous page</A> |
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| 26 | </TH></TR></TABLE><BR CLEAR=ALL> |
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| 27 | |
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| 28 | <center><h1> |
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| 29 | <HR noshade width="75%" size="2" align="center"> |
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| 30 | EXPGUI, part 5 |
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| 31 | <HR noshade width="75%" size="2" align="center"> |
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| 32 | </h1></center> |
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| 33 | |
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| 34 | <h3>A.5 Profile panel</h3> |
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| 35 | <DL><DL> |
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| 36 | The Profile panel is used to edit the profile values as well as |
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| 37 | their refinement flags and damping value. |
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| 38 | Note that there will be a set of profile parameters for each |
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| 39 | phase present in each histogram. |
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| 40 | <IMG SRC="new.gif" HEIGHT=13 WIDTH=36 alt="New!"> |
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| 41 | The "Change Type" button is used to select a new profile type for one |
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| 42 | or more histogram/phase combinations. |
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| 43 | <P> |
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| 44 | Note that the order that histograms appear in this |
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| 45 | panel is determined by the |
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| 46 | <a href="expguic.html#sorthist">"Sort histograms by"</a> option in |
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| 47 | the Options Menu. |
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| 48 | </DL></DL> |
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| 49 | <img SRC="5.gif" align=TEXTTOP alt="EXPGUI Screen snapshot"> |
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| 50 | <DL><DL> |
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| 51 | When more than one phase is present in the histogram, |
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| 52 | the profiles for all phases are shown. |
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| 53 | </DL></DL> |
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| 54 | <img SRC="5a.gif" align=TEXTTOP alt="EXPGUI Screen snapshot"> |
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| 55 | <DL><DL> |
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| 56 | <P><I> |
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| 57 | EXPGUI disables the refinement flags for profile terms |
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| 58 | </I>trns<I> or </I>shft<I> |
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| 59 | when the histogram zero point correction is refined. |
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| 60 | Neophyte users of GSAS sometimes incorrectly attempt to |
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| 61 | refine these terms together, which almost always causes problems. |
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| 62 | (Note that histogram |
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| 63 | </I>Zero<I> is refined for parallel beam diffraction instruments, |
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| 64 | typically synchrotron or neutron diffractometers, while |
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| 65 | </I>trns<I> and </I>shft<I> are |
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| 66 | appropriate only for Bragg-Brentano geometry [typically lab x-ray] instruments. |
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| 67 | In the Bragg-Brentano case, </I>shft<I> |
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| 68 | is related to the displacement of the |
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| 69 | sample from the scattering plane, which is usually subject to error and thus |
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| 70 | should be refined and </I>trns<I> is a correction for sample transparency, |
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| 71 | which is typically refined only with a low density sample.) |
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| 72 | </I><P> |
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| 73 | If |
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| 74 | <A href="expgui.html#multiplehistogram"> |
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| 75 | "Multiple Histogram Selection" mode</A> is set to "All", |
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| 76 | this panel is disabled. For other settings of this mode, |
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| 77 | profile values and settings can be collectively |
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| 78 | modified for groups of histograms and the panel appears slightly |
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| 79 | differently, as is seen below: |
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| 80 | </DL></DL> |
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| 81 | <img SRC="5c.gif" align=TEXTTOP alt="EXPGUI Screen snapshot"> |
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| 82 | |
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| 83 | |
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| 84 | <a name="ChangeType"> |
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| 85 | <h4>A.5.1 Edit Profile Type</h4> |
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| 86 | <DL><DL> |
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| 87 | Pressing the "Change Type" button causes a window like the one below to |
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| 88 | be displayed. |
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| 89 | <P><img SRC="5b.gif" align=TEXTTOP alt="EXPGUI Screen snapshot"><BR><P> |
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| 90 | Note that the default profile values are taken from the instrument parameter |
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| 91 | file (in the example above, a profile was selected where no |
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| 92 | such default values were defined and the current values (where appropriate) |
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| 93 | are taken from the current profile function. Through use of the appropriate |
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| 94 | buttons, selected values can be retained from the current profile when |
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| 95 | the function is changed or can be reset to default values. This latter |
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| 96 | capability can be useful even when not changing the profile type, if the |
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| 97 | profile terms have refined into a false minimum. |
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| 98 | |
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| 99 | </DL></DL> |
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| 100 | <a name="GlobalEdit"> |
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| 101 | </a><h4>A.5.2 Profile panel</h4> |
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| 102 | <DL><DL> |
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| 103 | <img SRC="5d.gif" align=TEXTTOP alt="EXPGUI Screen snapshot"> |
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| 104 | <P> |
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| 105 | When the button labeled "Global Edit" is pressed |
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| 106 | (<A href="expgui.html#multiplehistogram"> |
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| 107 | "Multiple Histogram Selection" mode</A> must be |
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| 108 | set to a single histogram type) the dialog above will be displayed. |
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| 109 | The entry boxes will appear blank |
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| 110 | and only those terms that are filled in will be changed when the "Set" |
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| 111 | button is pressed. |
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| 112 | |
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| 113 | </DL></DL><hr> |
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| 114 | <TABLE BORDER BGCOLOR="#FFFF40" ALIGN=RIGHT> |
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| 115 | <TR><TH><A Href="expgui.html">EXPGUI top</A> |
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| 116 | </TH><TH><A Href="expgui6.html">Next page</A> |
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| 117 | </TH><TH><A Href="expgui4.html">Previous page</A> |
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| 118 | </TH></TR></TABLE> |
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| 119 | |
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| 120 | </blockquote> |
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| 121 | </body> |
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| 122 | </html> |
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