ELECTRON-EMISSION IN 10-100KEVH-SURFACE COLLISIONS( AND HE+ GRAZING ION)

We have measured energy distributions of electrons ejected during graz ing 10-100 keV H+ and He+ ions scattering from Si surfaces for a broad range of electron observation angles. The distributions have contribu tions strongly dependent on the directions of incidence and observatio n. For observation regions around the specular reflection of the ions we have studied the angular dependence of the electron structure resul ting from electron transfer to the continuum of the effective ion pote ntial. Far from the ion scattering plane we have observed the Si Auger electron spectrum. We discuss the differences between the Auger peaks obtained by electron and grazing proton bombardment of Si surfaces pa rtially covered with O2 and Al.