Z_2 oscillation of ion-induced kinetic electron emission from metal due to the impact of heavy ions

概要

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A Monte Carlo simulation for the dependence of ion-induced kinetic electron emission on the target atomic number Z_2, is performed applying the dielectric function by using the "optical-data" model to calculate the mean free paths (electron excitation cross sections) of the projectile ion, the recoiling target atom and the excited electron in the target. The calculated electron yield, which decreases with the increase of the projectile ion number Z_1 and/or the Z_2 show the Z_2 oscillation, which is correlated with the electron number density of the conduction band electrons in the target (electron excitation probability) and the surface barrier of the target surface (electron escape probability). The full width at half maximum of the energy distribution narrows and the high-energy tail of it disappears with the increase of the Z_2 due to the large elastic energy loss of the projectile ion, for the high Z_1. Also, for secondary electron emission by the electron impact, the Z_2 oscillation is calculated as well. The global variation of the electron yield with the increase of the Z_2, differs from that by the projectile ion impact. The refinement of the theoretical model in the simulation should consider the actual band structure of the solid, the decay of the collective process (plasmon), the electron loss of the projectile ion, the excitation by the quasi-molecular effects, and so on.
香川高等専門学校の論文
2003-06-30