Convoy Electrons Emitted at Glancing Angle Incidence of MeV Light Ions on the Clean (001) Surfaces of SnTe Crystals

Abstract

Convoy electrons emitted at glancing angle incidence of MeV protons and He + ions on a clean (001) surface of SnTe are observed. It is found that the most probable velocities of convoy electrons are slower than those of the ions at proton incidence, whereas they are faster at He + incidence. A qualitative model is proposed to explain the experimental observations, in which the acceleration of convoy electrons by the wake-like induced charge on the solid surface at glancing angle incidence of swift ions is taken into account.