Changeset 833


Ignore:
Timestamp:
Dec 4, 2009 5:12:49 PM (11 years ago)
Author:
toby
Message:

# on 2005/02/09 21:47:28, toby did:
new feature: blank out shft & trans with zero use.

File:
1 edited

Legend:

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Added
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  • trunk/doc/expgui5.html

    • Property rcs:date changed from 2002/04/12 19:49:04 to 2005/02/09 21:47:28
    • Property rcs:lines changed from +3 -4 to +19 -4
    • Property rcs:rev changed from 1.8 to 1.9
    r571 r833  
    5454<img SRC="5a.gif" align=TEXTTOP alt="EXPGUI Screen snapshot">
    5555<DL><DL>
    56 
    57 <P>
     56<P><I>
     57EXPGUI disables the refinement flags for profile terms
     58</I>trns<I> or </I>shft<I>
     59when the histogram zero point correction is refined.
     60Neophyte users of GSAS sometimes incorrectly attempt to
     61refine these terms together, which almost always causes problems.
     62(Note that histogram
     63</I>Zero<I> is refined for parallel beam diffraction instruments,
     64typically synchrotron or neutron diffractometers, while
     65</I>trns<I> and </I>shft<I> are
     66appropriate only for Bragg-Brentano geometry [typically lab x-ray] instruments.
     67In the Bragg-Brentano case, </I>shft<I>
     68is related to the displacement of the
     69sample from the scattering plane, which is usually subject to error and thus
     70should be refined and </I>trns<I> is a correction for sample transparency,
     71which is typically refined only with a low density sample.)
     72</I><P>
    5873If
    5974<A href="expgui.html#multiplehistogram">
     
    6277profile values and settings can be collectively
    6378modified for groups of histograms and the pane appears slightly
    64 differently
     79differently, as is seen below:
    6580</DL></DL>
    6681<img SRC="5c.gif" align=TEXTTOP alt="EXPGUI Screen snapshot">
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