Neutral fractions calculations for grazing incidence H+/Al(111) collisions

Abstract

We have calculated outgoing H(1s) fractions in a large range of impact velocities for protons impinging on Al(111) with a grazing incidence of 0.5°. Capture and loss for Resonant and Auger processes are taken into account and the role of the surface-plasmon-assisted electron capture mechanism is also investigated. Consideration of all these mechanisms allow to reach a good agreement with experimental measurements. A detailed analysis of our results show that Resonant processes dominate for v||≤1.5 although the surface-plasmon-assisted capture mechanism has a significant contribution around the Fermi velocity (vF≈0.9). For higher velocities Auger capture and loss mechanisms (and also Resonant loss) mainly explain the experimental findings.