Trajectory-dependent energy loss for swift He atoms axially scattered off a silver surface

[摘要] Angle- and energy-loss-resolved distributions of helium atoms grazingly scattered from a Ag(110) surface along low indexed crystallographic directions are investigated considering impact energies in the few keV range. Final projectile distributions are evaluated within a semi-classical formalism that includes dissipative effects due to electron hole excitations through a friction force. For mono-energetic beams impinging along the [1 (1) over bar0], [1 (1) over bar2] and [001] directions, the model predicts the presence of multiple peak structures in energy-loss spectra. Such structures provide detailed information about the trajectory-dependent energy loss. However, when the experimental dispersion of the incident beam is taken into account, these energy-loss peaks are completely washed out, giving rise to a smooth energy-loss distribution, in fairly good agreement with available experimental data. (C) 2014 Elsevier B.V. All rights reserved.

[发布日期] 2014-12-01

[效力级别]  Proceedings Paper

[关键词] Energy loss;Grazing incidence;Metal surface