Monte Carlo simulation of kinetic electron emission induced by MeV He+ andHe++ ions incident on polycrystalline aluminium

A theoretical study of the characteristics of kinetic electron emission ind uced by He+ and He++ ions (in the MeV-range) incident on polycrystalline al uminium targets is presented in this paper. The models of interactions for the incident projectiles as well as for the excited electrons are described . Especially, the electron excitation induced by incident Het is calculated by taking into account the structure of the composite projectile. Charge e xchange processes by the projectiles are also considered. The subsequent el ectron transport and escape is calculated by means of a Monte Carlo simulat ion code. The calculated electron emission yield is compared to experimenta l results. The differences between He+ and He++ are discussed, the role of the electron lost by He+ being especially emphasised. (C) 2001 IMACS. Publi shed by Elsevier Science B.V. All rights reserved.