Abstract
We study the emission of high-velocity electrons from hydrogen projectiles colliding with He targets at intermediate energies. Previous experimental results showed a prominent structure at a velocity approximately three times that of the projectile, when the electron distribution was normalized to that resulting from H + impact. This structure was understood as due to the emission of projectile electrons which undergo two consecutive binary collisions, with the target and the projectile. In this paper we present new experimental data and a simple quantum-mechanical description that supports our interpretation and gives a qualitative agreement with the experimental results.
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