Recent work has indicated that the single-scattering theory of x-ray absorption may be valid down to much closer to the edge than previously thought. It is in this region that the plane-wave approximation used in the standard extended x-ray-absorption fine structure analysis breaks down. Using a simple reformulation, we obtain modified backscattering amplitude and phase-shift functions which are similar to those of Teo and Lee but which use the full curved-wave theory for single scattering. These can then be used to analyze experimental data without any modification of those programs that presently use the functions of Teo and Lee. We also present results of using this method to compare experimental data with theoretical calculations for copper metal and NiO.
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McKale et al. (1986) studied this question.
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