SEXAFS without X-rays

Abstract Surface extended X-ray absorption fine structure provides a means of finding the structure of disordered adsorbate layers on a clean substrate, low energy electron diffraction techniques having been confined to well-ordered systems. Here we show how the diffuse patterns characteristic of disordered adsorbates can be analysed to yield structural information. The theory contains terms which are entirely analogous to SEXAFS theory, showing that all the information contained in a SEXAFS experiment is present in a diffuse scattering measurement. Not only that, but the amount and detail of information available for diffuse scattering is much greater than for SEXAFS. The interpretation of diffuse scattering is no more complex than for LEED from the clean well-ordered substrate.

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