One-electron models of kinetic electronic excitations in metallic solids bombarded by slow atomic particles (<2 keV) will be compared with kinetic electorn emission experimetns. As some of the experiments on energetic electrons cannot be explained in terms of the one-electron processes possible extension of emission models will be described. In particular, it will be assumed that electons excited in collision cacades can strongly interact and this electron-electron interaction will be modelled either by a rapid (within few fs) or an instantaneous thermalization of excitations. The excitation processes will be studied at different temporal stages of the cascade.
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