Abstract
In this work we treat inelastic scattering of fast electrons on metal clusters in the range of transferred energies above the ionization threshold. We demonstrate that in this energy range many-electron collective excitations, namely, the volume plasmons, provide dominating contribution to the differential cross section resulting in its resonance behavior. The volume-plasmon resonances excited in the cluster during the collision decay via the ionization process. We determine the resonance frequency and the autoionization width of the volume plasmon excitations. In order to elucidate the role of plasmon excitations, we calculate the differential cross section of the process using two different approaches. We calculate the cross section in the random-phase approximation using the Hartree-Fock wave functions as a basis and accounting simultaneously for all single-particle and collective excitations in the cluster. We compare the results of this approach with those obtained in the plasmon resonance approximation.
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