Abstract
Inelastic scattering of electrons by small metal particles is investigated with full inclusion of spatial dispersion effects. In sharp contrast to results obtained from classical studies, based on the use of a local dielectric constant, the differential cross section for larger collection angles is rather diffuse because of considerable transfer of oscillator strength from collective modes to single particle-hole pairs. This result shows clearly the need for a truly microscopic theory for the explanation of energy-loss properties of small (\ensuremath{\lesssim} 2 nm) metal particles.
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