Extended X-Ray-Absorbtion Fine-Structure Beats: A New Method to Determine Differences in Bond Lengths

Abstract

The superposition of two scattering shells produces beats in the envelope function of the extended x-ray-absorption fine-structure spectrum and a modulation in the scattering phases. From the $k$ values of the extrema in the envelope function and from the inflection points of the phases the separation of these shells can be calculated without knowledge of the scattering phases of the single shells. A resolution in $R$ space up to 0.02 \AA{} can be obtained even in cases where methods used so far are not able to resolve the scattering shells.