Plasmon excitation by charged particles interacting with metal surfaces

Details Plasmon excitation by charged particles interacting with metal surfaces Plasmon excitation by charged particles interacting with metal surfaces

1999-04-20

arxiv.org/abs/cond-mat/9904284v1

Phys. Lett. A 256, 405 (1999)

Physics

Condensed Matter

Materials Science

4 pages, 3 figures, o appear in Phys. Lett. A

Scientific paper

10.1016/S0375-9601(99)00264-9

Recent experiments (R. A. Baragiola and C. A. Dukes, Phys. Rev. Lett. {\bf 76}, 2547 (1996)) with slow ions incident at grazing angle on metal surfaces have shown that bulk plasmons are excited under conditions where the ions do not penetrate the surface, contrary to the usual statement that probes exterior to an electron gas do not couple to the bulk plasmon. We here use the quantized hydrodynamic model of the bounded electron gas to derive an explicit expression for the probability of bulk plasmon excitation by external charged particles moving parallel to the surface. Our results indicate that for each ${\bf q}$ (the surface plasmon wave vector) there exists a continuum of bulk plasmon excitations, which we also observe within the semi-classical infinite-barrier (SCIB) model of the surface.

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