Electronic excitation of Ne induced by ion bombardment on Al(111) surface. Experiment and simulation

We present the result of an experiment and a simulation of the electronic excitation of the projectile induced by the bombardment of Ne+ ions at 5 keV on an Al(111) surface. The excitation is identified by the energy spectra of emitted electrons. At the glancing angle of 6 degrees, when the ion beam is along the [ITO] direction of the surface, the intensity of the electron peaks is weak and it becomes important when the crystal is rotated by +/-10 degrees. At a fixed crystal orientation, the intensity rises to a maximum and then decreases when the glancing is increasing. This variation is interpreted in terms of shadowing effect. The agreement between experimental results and those obtained by the simulation is reasonable when the thermal vibrations are included in the model.