Electron emission in grazing HCl-LiF(001) collisions

We have measured the number statistics of emitted electrons for multiply ch arged Ar-ion impact on a clean LiF(001) surface under grazing incidence con ditions. For projectiles reflected from the surface we have also recorded t he scattering distribution on a two dimensional detector in coincidence wit h the number of emitted electrons. In this way it was possible to distingui sh electron emission for three different types of trajectories: non-penetra ting projectiles specularly reflected from the topmost surface plane, proje ctiles entering the target and being reflected from subsurface layers and p rojectiles penetrating deeply into the target. The results support existing concepts on the charge state dependence of potential- and kinetic electron emission from poly- and monocrystalline LiF gained in normal incidence exp eriments.