You can find recorded and fitted EXAFS and HR-EXAFS spectra of PtO2 in our following paper: 

Laskar, C., Bazarkina, E. F., Kokh, M. A., Hazemann, J. L., Foulon, S., Leynaud, O., ... & Pokrovski, G. S. (2022). Exploring Platinum Speciation with X-ray Absorption Spectroscopy under High-Energy Resolution Fluorescence Detection Mode. Minerals, 12(12), 1602.

The spectra can be directly downloaded at the following link on the sshade database: 

https://www.sshade.eu/data/experiment/EXPERIMENT_GP_20181107_001

https://www.sshade.eu/data/experiment/EXPERIMENT_CL_20210211_001

Maybe it could help you to deal with your fitting problem to compare your spectra and your fit with ours,

Regards,

Clément LASKAR

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Dear all,

I am looking at EXAFS of PtO₂ powders and Pt particles supported on TiO₂. I used a beta-PtO₂ crystal structure data for the PtO₂ EXAFS and after the first shell fit, I observed a large shift in Eo (delta Eo of ~14 eV) in my fit parameters. When I tried to fit the Pt foil to obtain the So², the energy shift also seemed high (delta Eo of ~7 eV). I am wondering if there could be a problem in the selection of Eo prior to EXAFS analysis? I left the Eo as the energy at the first peak of first derivative (ifeffit default).

All of the data were also aligned using the reference foil in Athena before looking at EXAFS. I am wondering what would have caused this shift? Any help is appreciated, thank you.

Best regards,

Yanny