Dear Blaise,
A chi^2 of 500 means that on average your model is off by 500 sigma, or
500*500=25 counts. This usually means some technical detail has gone
wrong in file formats or weights.
If you don't manage to figure out the problem then if you can post your
refinement somewhere I am su
vyov [mailto:[EMAIL PROTECTED]
Sent: Thursday, 18 September 2008 14:34
To: rietveld_l@ill.fr
Subject: Re: Beginer problems, difficulty charecterizing our diffractometer...
Dear Blaise,
The strong peak asymmetry may result from high-divergence Soller slits
installed in your instrument. You
Dear Blaise,
The strong peak asymmetry may result from high-divergence Soller slits
installed in your instrument. You may consider using sollers of lower
divergence that normally allows easier peak shape approximation and, besides,
increases the resolution (at the expense of intensity, of cours
Hi,
I am going to be in the same boat soon, especially regarding obtaining
instrument parameters for a new instrument. But one thing I do know, is that
to get the polarization parameter, quartz is not a great standard. For
polarization factors, you need something really simple, with heavy at
From what I have been told and led to believe, Chi^2 isn't the be all
and end all. This will really depend upon your counting statistics. Pay
more attention to your Rp, Rwp and what your fit actually looks like.
Also, try performing a Le Bail fit to your data and see what Chi^2 you
get. This sh
