| Numéro |
J. Phys. Colloques
Volume 47, Numéro C8, Décembre 1986
EXAFS and Near Edge Structure IV
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|---|---|---|
| Page(s) | C8-31 - C8-35 | |
| DOI | https://doi.org/10.1051/jphyscol:1986804 | |
EXAFS and Near Edge Structure IV
J. Phys. Colloques 47 (1986) C8-31-C8-35
DOI: 10.1051/jphyscol:1986804
1 Department of Physics, FM-15, University of Washington, Seattle, WA 98195, U.S.A.
2 MST-5 MS G730, Los Alamos National Laboratory, Los Alamos, NM 87545, U.S.A.
3 Laboratori Nazionali di Frascati dell Istituto Nazionale di Fisica Nucleare, I-00044 Frascati, Italy
J. Phys. Colloques 47 (1986) C8-31-C8-35
DOI: 10.1051/jphyscol:1986804
SPHERICAL WAVE CORRECTIONS IN XAFS
J.J. REHR1, R.C. ALBERS2, C.R. NATOLI3 et E.A. STERN11 Department of Physics, FM-15, University of Washington, Seattle, WA 98195, U.S.A.
2 MST-5 MS G730, Los Alamos National Laboratory, Los Alamos, NM 87545, U.S.A.
3 Laboratori Nazionali di Frascati dell Istituto Nazionale di Fisica Nucleare, I-00044 Frascati, Italy
Abstract
Spherical wave corrections in XAFS (x-ray absorption fine structure) are discussed using a new high-energy approximation based on asymptotic expansions. This approximation replaces the plane-wave approximation and is found to be in good agreement with exact treatments almost to the absorption edge. With this formulation the single-scattering XAFS formula is recovered in terms of distance-dependent back-scattering amplitudes. Multiple-scattering contributions in XAFS and spherical wave corrections in angular resolved photoemission are treated similarly.