NEAR SPECULAR REFLECTION OF C-60 IONS IN COLLISIONS WITH AN HOPG GRAPHITE SURFACE

Collisions of C60+ ions with an HOPG surface are studied in an energy range between 140 and 450 eV for a geometry which allows to change the angle of incidence with respect to the normal direction of the surface, keeping the total deflection angle at 40-degrees. The kinetic energy of the scattered ions is found to be about 10 to 20 eV and nearly independent of the impact energy. The angular distribution peaks at nearly specular reflection for 140 eV, but much closer to the normal direction as the impact energy is increased.