Dear Quiang,
basically you are asking whether the distance A-B is equal to the
distance B-A. I would say, obviously this should be the case. If you
measured both edges and you fit both spectra together you can (and will
most probably) use this trivial fact to reduce the number of free
parameters.
But, maybe that was not your question. You rightly mention the phase
shift. It will be different, however the difference should be small. The
phase shift has a Z dependency, but since Cu and Zn are neighbours in
the PSE the difference is small. So if you look (very) closely on the
not phase shift corrected FT you will see a small difference between the
respective peaks in the two FT.
You might have a look here:
https://urldefense.us/v3/__https://speakerdeck.com/bruceravel/exafs-phase-shifts__;!!G_uCfscf7eWS!YI4AJE0qkMZMXV9CgZX_X06TLvCCZ3BTEi1sqrDGDd1URNrU7hmufKpS2sZwrF6v-n6esiQL4iKuvKECTSqTu3welMeqHtL_aAUUSg$
Best regards,
Edmund
On 27.02.25 09:25, "Qiang Chang (常强)" via Ifeffit wrote:
Hi dear XAS communities, I have a question about whether the distance
of the same path should be same in the R space for each element’s
edge? For example, suppose a diatomic pair Cu-N-Zn structure, Cu-edge
and Zn-edge EXAFS are measured separately
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Hi dear XAS communities,
I have a question about whether the distance of the same path should be same in
the R space for each element’s edge? For example, suppose a diatomic pair
Cu-N-Zn structure, Cu-edge and Zn-edge EXAFS are measured separately and FT
transformed using Athena software. Should the Cu-N-Zn peak in Cu-XAFS be in the
same position with the Zn-N-Cu peak in Zn-XAFS, although both must be the same
after phase correction. Thank you very much for your kind explanation.
Best regards,
Qiang
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