ASYMMETRY IN THE EXCITATION OF PLASMONS BY SWIFT PARTICLES TRAVERSING A SURFACE AT OBLIQUE INCIDENCE

J. L. GERVASONI; F. NAVARRETE; S. SEGUI; N. R. ARISTA

Grenoble

Conferencia; ECOSS 32 - European Conference on Surface Science; 2016

Societé Fracaise du Vide

The study of plasmon excitation is of great relevance for the characterisation of surfaces,thin films, and nanoparticles using different charged-particles spectroscopic techniques. Inthis work we are interested in analyzing the asymmetry found in the production of plasmonsby fast charged particles entering or leaving a semi-infinite material through a planar surface.We employ the specular reflection model and the extended pseudo-medium method [1] inorder to assess the energy loss rate due to plasmon excitation along the projectile'strajectory. In particular, we analyze the integration conditions of the transferred momentum,showing that an approximation usually applied in the literature drives to unconsistent results.We obtain results for a variety of experimental settings, spanning a range of velocities andincidence angles to study how the observed asymmetry between incoming and outgoingtrajectories depend on these variables.