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- Hatakada, K, et al.
(författare)
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Theoretical study of the non-local optical potential in EXAFS spectra
- 2001
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Ingår i: Journal of Synchrotron Radiation. - 1600-5775. ; 8:2, s. 207-209
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Tidskriftsartikel (refereegranskat)abstract
- We study the optical potential effects on the extended x-ray absorption fine structure (EXAFS) and x-ray photoelectron diffraction (XPD) spectra. For the valence electron optical potential we use a local density approximation because the charge density changes fairly slowly, whereas we use a non-local optical potential for the core electron part based on GW-approximation. In the Br K-edge EXAFS spectra the present optical potential gives rise to the phase difference and the amplitude reduction; the agreement with the experimental result is excellent. In the N-1s XPD spectra for N2/Ni(100), the spherical wave effects enhance the effects due to the optical potential.(19 refs)
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- Hatakada, K., et al.
(författare)
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Theory of spin-polarized optical potential
- 2001
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Ingår i: Journal of Synchrotron Radiation. - 1600-5775. ; , s. 210-212
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Tidskriftsartikel (refereegranskat)abstract
- We develop an approximation for the non-local spin-polarized optical potential theory for atoms in solids at intermediate and high energy. The present approximation for the optical potential builds on the GW-expression. We separate the RPA polarization propagator into a core electron and a valence electron part, and can then achieve a corresponding separation of the optical potential. For the valence electron optical potential we use a local density approximation because the charge density changes fairly slowly, whereas we use a non-local optical potential for the core electron part. Both of them depend on the spin-polarization. We apply this method to electron-Fe elastic scattering in solids, and discuss the results.(16 refs)
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