[Ifeffit] Problems with Reference Paths
newville at cars.uchicago.edu
Fri Jul 11 08:15:12 CDT 2003
On Fri, 11 Jul 2003, Norbert Weiher wrote:
> Cheers friends,
> now a short question concerning reference paths calculated by FEFF (I use
> I have a series of spectra of catalysts containing V,P and O. Data was taken
> at the V K edge. I know from literature, that the first coordination shell
> should contain some 5-6 O atoms. The problem (and this is really the first
> time I ever had problems with this) is that ifeffit (V 1.2.1) is not capable
> of fitting even the first shell. As it works fine for model systems, e.g. Au
> foil, I wonder if I have problems with the calculation of the references...
> As first try, I re-calculated the feffxxxx.dat files with the SCF flag turned
> on (which I never used before for the EXAFS) - the problem persisted. Has one
> of you experienced similar problems and knows how to come over?
I'm not sure I understand the trouble you're having. Could you send
an a more complete example? You shouldn't need SCF for EXAFS. In
fact, I'd recommend trying Feff7 or Feff6 if you're having trouble
with Feff8.1 calculations for EXAFS.
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