The small-atom approximation in EXAFS and surface EXAFS

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Abstract
A simplification of the exact curved-wave theory of extended X-ray absorption fine structure (EXAFS) is presented. This simplified theory is obtained from an approximation to the wavefunction which is based on the physics of the scattering process, and it is found to be in good agreement with the exact theory almost down to the absorption edge. Use of this theory enables multiple-scattering contributions to the EXAFS to be included in online fitting programs since within it such contributions take very little more time to compute than do the single-scattering terms. The theory may also be used for single-crystal and surface EXAFS analyses.