To all:
 
What is the correct procedure for refining U,V,W?  It is my understanding that 
those parameters are a function of instrument geometry.  Does one use a 
standard material to determine U,V,W and then fix their values for the 
instrument you're using?....or do the values of U,V,W change depending on the 
sample being examined?  If so, why do the values change?
 
Thanks in advance.
 
Frank May

________________________________

From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]
Sent: Sun 11/30/2008 1:32 PM
To: rietveld_l@ill.fr
Subject: Re: I am a newcome, how can I begin my rietveld refinement analysis



Hi, Li:

To me, the most wonderful tool to determine initial peakshape parameters is
CMPR.
CMPR is especially oriented to GSAS and gives you GU, GV, GW etc. And when
you use EXPGUI for GSAS, you can also try Graphs->widplt to see how FWHM
develops when parameters are tuned.
When you prefer Fullprof, you should take a factor to get U, V, W etc. i am
not sure about the facor exactly, maybe GX~100X(X=U, V, W), er..? Anyway,
just go ahead and make a try.

Faithfully
Jun Lu
----------
Lst. Prof. Lijie Qiao
Department of Materials Physics and Chemistry
University of Science and Technology Beijing
100083 Beijing
P.R. China
http://www.instrument.com.cn/ilog/handsomeland/




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