<div dir="ltr">Adam,<div><br></div><div>Thank you and several others, especially Bob and Wenqian, who provided useful information. It turns out, to my best of understanding, the phase fraction refers to mole fraction, or number of unit cells. The weight fraction is then derived based on cell volume.</div><div><br></div><div>My data was collected at the APS@Argonne, which ran non-top off mode, meaning at certain times of a day the beam intensity deeply increases as a result of ring refill. The absolute value of phase fraction may be influenced, but the weight fraction, on the other hand, has some normalization calculation thus is not influenced.</div><div><br></div><div>Thank you all again. </div><div><br></div><div>Best,</div><div>Yifeng</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Fri, Feb 19, 2021 at 11:52 AM Creuziger, Adam Abel (Fed) via GSAS-II <<a href="mailto:gsas-ii@aps.anl.gov">gsas-ii@aps.anl.gov</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">



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Re Yifeng:
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<div>I am not sure on exactly what units are for "phase fraction”, but looking athletic GSASIIpwd.py it looks like this is the scale of the histogram for this phase. That can get a little convoluted with the Histogram Scale Factor in sample parameters.
  You can set a constraint for this if you have multiple phases (constraints-> histogram/phase -> ‘Scale’   I end up with 0:0:Scale+1:0:Scale=1 as the equation)</div>
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<div>The weight. fraction includes the atomic weight (including occupancy) divided by the unit cell volume. I found this description on line 132 of GSASIIddataGUI.py.  <br>
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<div>For exporting, Export-> Powder data as-> Text file  worked to some extent.  I’ve also been using the scripting toolkit, and that works well.</div>
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