Abstract
X-ray absorption spectroscopy (XAS) is a local probe of the geometric and electronic structure of individual atomic species in condensed matter. With the availability of intense, polarized and highly collimated X-rays from storage rings the technique has found a widespread application in physics, chemistry, biology and geology. Multiple scattering of the photoelectron in the edge region and in shadowing configurations makes it possible to deduce higher correlations in the atomic arrangement besides the pair correlation obtained from standard EXAFS. This gives radial and angular information on the geometric structure. A promising new application is XAS under total external reflection with detection of the absorption by fluorescence. This allows in-situ investigations of solid-solid, solid-liquid and solid-gas interfaces. New dedicated storage rings with high brilliance will have a major impact on XAS in dispersive mode and for very dilute systems.
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