Hi Qiang,
The fitted distance, as seen from each of the metal atoms should be the same, however, the Real Space Fourier Transform of the two edges may not have the peak in the same position because of the phase shift which will differ in the two paths. The phase shift depends on the backscatterer and that is clearly different depending on the absorber atom.
Carlo
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Carlo Segre, Duchossois Professor of Physics
Illinois Institute of Technology
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From: "Qiang Chang (常强)" via Ifeffit
Sent: Thursday, February 27, 2025 2:25 AM
To: ifeffit@millenia.cars.aps.anl.gov
Cc: "Qiang Chang (常强)"
Subject: [Ext][Ifeffit] Diatomic distance on each EXAFS of both elements
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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