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Re: [sdpd] ID31 instrument resolution file
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<p>Dear Riffat,<br>
<br>
This is what I normally suggest for starting a refinement from ID31 <br>
data (which is the same as we used for BM16 data). Normally the effect <br>
of the instrument is much less than effects due to the sample.<br>
Thus use the profile allowing Peter Stephens's anisotropic peak <br>
broadening, and just put in a very small value for the Gaussian W, say <br>
2. This removes essentially the contribution from the instrument, and <br>
then refine Gauss and Lorentz bits reflecting the effect of the sample, <br>
then anisotropy if required. For asymmetry, a typical situation is with <br>
a 2-mm-wide beam incident on the sample, and a 4-mm-wide receiving slit, <br>
with about 800 mm between the two, but your experiment may have been <br>
different; did you note down the values? If you refine the asymmetry <br>
parameters, then in the early stages constraining the two parameters in <br>
the ratio 1:2 can help stability.<br>
It's true that fitting ID31 peak shapes can be tricky because of <br>
sample effects, but this is usually enough to get you started with a <br>
Rietveld refinement,. However you may have to work quite a bit to get <br>
that perfect fit.<br>
<br>
Best regards<br>
<br>
Andy<br>
<br>
On 08/11/2010 10:23, Riffat Siddiqui wrote:<br>
><br>
> Dear SDPD group,<br>
><br>
> I'm vitally need ID31 beamline instrument resolution file (in GSAS <br>
> format).<br>
> Kindly ask to share with it if somebody has it.<br>
><br>
> All the best,<br>
> Riffat<br>
><br>
> [Non-text portions of this message have been removed]<br>
><br>
> <br>
<br>
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