Hi Matt,
Thank you very much for answering my mail :)
FEFF predicts the first shell to be around 1.9Ang, but processing the data in athena (with various attempts in background subtraction, k weighting and so on) always gives me a strong peak in |chi(R)| around 1A. The data is quite noisy, do you think it is possible that this peak is caused by errors or noise in |chi(k)| for high k-values? I am not sure if this is a valid argument, but high k values correspond to short wavelengths which then are responsible for peaks close to the central atom (this is more of a physical idea)? Can it be that a peak which is too close (like on 1 Ang instead of almost 2Ang) is caused by outliers in high k-ranges?
If so, that would NOT mean then that if I only need information on the first 3,4Ang I only need |chi(k)| for high k values right? Do I understand correctly that the small features in |chi(k)| determine the |chi(R)| for high R values and the slow oscillations in chi(k) determine the R-spectrum for low R-values (more of a mathematical thought)?
Best,Julian
Von: Ifeffit [mailto:ifeffit-bounces@millenia.cars.aps.anl.gov] Im Auftrag von Matt Newville
Gesendet: Mittwoch, 11. April 2018 05:04
An: XAFS Analysis using Ifeffit