Feder, R. and Gollisch, H., Scheunemann, T., Berakdar, J., Henk, J.
In: Many Particle Spectroscopy of Atoms, Molecules, Clusters, and Surfaces pp 435-449 (Eds.) Berakdar, J. and Kirschner, J., Kluwer Academic/Plenum Publishers, New York, USA 2001A short review is given of recent theoretical developments in (e,2e) and (g,2e) spectroscopy from surfaces in reflection geometry. We first outline a general formal framework and currently viable approximations. Subsequently, a selectrion of numerical results demonstrates the quantitative agreement with experimental data, the extreme surface sensitivity of (e,2e), the imaging of a surface state dispersion, the influence of the Coulomb pair correlation between the two detected electrons, and the usefulness of spin-polarized primary electrons for the study of spin-dependent collision dynamics and of magnetic surface properties.
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