Hi all,
I just read the discussion on sigma^2 values for multiple
scattering paths . One thing is clear that inclusion of multiple scattering
path may increase the quality of fit. I have also some questions related to
MS paths.
1. What else information can be obtained from multiple
Dear all,
It is reasonable to assign a constant fraction by which unit cell
expands at a given temperature of XAFS measuremnt and so the variation
in the path lengths for every single scattering paths could be assigned
as delr = alpha * Reff. Similarly, one can assign sigma2 value for each
For bond angles, this google search would be helpful:
buckling angle multiple scattering xafs
Anatoly
From: ifeffit-boun...@millenia.cars.aps.anl.gov on behalf of Abhijeet Gaur
Sent: Thu 10/7/2010 3:21 AM
To: ifeffit
Subject: [Ifeffit] Multiple scattering
For relationships between sigma2 for MS and SS paths, some are listed in the
Appendix to this article:
P. Shanthakumar, et al, Physical Review B 74, 174103 (2006).
Anatoly
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Jatin,
IF the uniform expansion model is valid for single scattering paths,
then it is for multiple scattering paths as well. For some materials,
particularly those with cubic space groups, that's got a good chance
of being a useful model. Others tends to distort with changes in
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Message: 5
Date: Thu, 07 Oct 2010 12:05:10 +0200
From: Jatinkumar Rana jatinkumar.r...@helmholtz-berlin.de
To: Ifeffit users ifeffit
Not at all unusual, Han Sen. If you think about the EXAFS equation,
you'll see that sigma^2 and amplitude primarily affect the amplitude
of the signal, while distances affect the position of the peak in the
Fourier transform (or equivalently, the spacing of peaks in chi(k)).
So sigma^2 and
