Grazing incidence collisions of fast protons with insulators: electron emission around the convoy peak

A general model to calculate electron spectra in grazing incidence ion-surface collisions is presented. It is based on the use of atomic form factors for projectile ionization and incoherent scattering functions for the target. The model is applicable for arbitrary systems whose electrons can be described by localized atomic orbitals, like ionic crystals. For 100 keV protons on LiF surfaces we find that the projectile electron contribution to the convoy peak is larger than the contribution from target ionization. (copyright 2004 WILEY-VCH Verlag GmbH and Co. KGaA, Weinheim) (orig.)