Convoy electron emission and energy loss of swift protons in grazing collisions against LiF(001), ClK(001) and IK(001) surfaces

I. ALDAZABAL; M.S. GRAVIELLE; A. ARNAU; J.E. MIRAGLIA; V.H. PONCE

Austria

Workshop; 16th. International Workshop on Inelastic Ion-Surface Collisions (IISC); 2006

International Committee of the 16th. IISC

At grazing angles of incidence, electrons emitted in ion surface collisions give information about the atomic and electronic structure of the surface. However, at high emision energies the details of the electronic structure of the target are not so relevant and two structures appear which have their origin in binary ion-atom collisions. They are the so-called convoy and binary electron peaks. Electrons contributing to the convoy electron peak (CEP) arise on one side from the electrons extracted from the surface (electron capture to the continuum or ECC contribution) and on the other from the electrons ionized from the neutralized projectile (electron loss to the continuum or ELC contribution). In the present work we calculate these two contributions to the CEP taking into account the charge state of the projectile. We also compute the projectile energy loss per unit path lenght, or stopping power, as well as the energy loss along the ion trajectory.