HI, Do you know what the Ramsauer-Townsend effect is, and how it manifests in XAFS (for heavier metals in particular)? Try simulating Pt foil, and process the simulated chi(k) with a large k range, and shorter ranges. See how k-range affects resolution? Look at F(k) in the feff0001.dat file. See the structure? (Sorry...been slow getting my new computer fully running, otherwise I would do this for you to illustrate.) In short, the foil, processed to kmax = 20 invAng looks fine. e.g. like: https://urldefense.us/v3/__https://www.researchgate.net/figure/Structural-an... or https://urldefense.us/v3/__https://www.youtube.com/watch?v=FMHQ2Wi0fVM__;!!G... Bruce has a short lecture on speakerdeck on this for Au: https://urldefense.us/v3/__https://speakerdeck.com/bruceravel/the-ramsauer-t... Hope this helps... cheers, -R. On Sun, Nov 2, 2025 at 5:31 PM FAN Dongxiao via Ifeffit < ifeffit@millenia.cars.aps.anl.gov> wrote:
Dear All, My target is the L3-edge of Pt foil and Pt-contained high-entropy alloy. In the Pt foil L-edge FT-EXAFS (k range: 3-20 A-1), there is a strange peak lower than the first near neighboring peak. This low-r peak makes confused because ZjQcmQRYFpfptBannerStart This Message Is From an External Sender This message came from outside your organization.
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Dear All,
My target is the L3-edge of Pt foil and Pt-contained high-entropy alloy.
In the Pt foil L-edge FT-EXAFS (k range: 3-20 A-1), there is a strange peak lower than the first near neighboring peak.
This low-r peak makes confused because I did not found in other metal foil spectra.
Also this peak cannot be reduced by increasing the Rbkg value.
When I decrease the k range, this strange peak disappears with phase shift.
In the Pt-contained high-entropy alloy, this strange peak becomes more pronounced than the 1st NN.
Can anyone can give me help interpret this strange peak?
Best regards,
Fan
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JASRI, Sping8
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