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Indexed by:期刊论文

Date of Publication:2009-06-01

Journal:PHYSICAL REVIEW A

Included Journals:SCIE、EI、Scopus

Volume:79

Issue:6

ISSN No.:1050-2947

Key Words:energy loss of particles; hydrodynamics; ion-surface impact; metallic thin films

Abstract:We consider a charged particle moving parallel to the surface of a metal film covering on the semi-infinite dielectric substrate with constant speed. By means of the linearized quantum hydrodynamic theory, the induced electron gas density and the stopping power are studied, taking into account the quantum statistical and quantum diffraction effects. The calculation results show that an oscillatory wake field appears apparently behind the particle at both of the surfaces of the metal film and the effect of the film thickness on the electron gas density cannot be neglected when film is thinner. Besides, the dependence of the stopping power on the film thickness, particle position, and the density parameter are analyzed. Finally, the stopping power of our results is compared with those based on the local frequency-dependent dielectric approach.