Abstract
We report on binary encounter electron ejection from thin solid foils (C, Al) by highly charged heavy ions (Ar17+,18+) at high energies (13.6–77 MeV/u). For the collision systems 13.6 MeV/u Ar17+ on C and 77 MeV/u Ar18+ on Al, comparison has been made with a recent relativistic theory. This theory, based on the Electron Impact Approximation, describes the shape of the binary encounter electron peak and the angular dependence of the cross section well for thin targets only. For thicker targets, solid state effects (in particular, electron transport) influence the shape of the binary encounter electron peak initially given by the target atom Compton profile. New experiments were recently performed with Ni28+ (45 MeV/u).
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