Channeling effect in electronic spectra produced by grazing Impact of fast protons on insulator surfaces

C. D. ARCHUBI; M. S. GRAVIELLE

illinois

Conferencia; XXVI Internacional Conference on Photonic, Electronic and Atomic Collisions (ICPEAC),; 2009

Electron emission due to grazing scattering of fast protons from LiF and KCl surfaces is studied underaxial incidence conditions. The differential emission probability is calculated within a distorted-wave formalism,taking into account axial channeled trajectories. For different emission angles, electronic spectra for protonincidence along the two principal crystal axes ([ 100] and [110]) are compared with those corresponding to animpact velocity in a random direction, finding effects associated with the channeling conditions.