Role of multiple scattering in x-ray photoelectron spectroscopy and Auger-electron diffraction in crystals

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Abstract
The angular anisotropies of x-ray photoelectron and Auger peak intensities from Cu in epitaxial Ni-Cu-Ni(100) sandwich structures allow, for the first time, the breakdown of the observed diffraction from a crystal into the contribution from each layer of atoms. These data show that the primary role of multiple scattering of the outgoing electron wave is to deflect electron trajectories, thereby removing intensity from the strong forward-scattered beams which form upon the initial scattering events, i.e., scattering by nearest-neighbor and next-nearest-neighbor lattice atoms.