Simulation of ballistic effects during scattering under glancing angles of incidence from crystal surfaces
A direct comparison of the results of molecular dynamics (MD) and sequential binary collision (BCA) simulations of the scattering of 3 keV light (He) and heavy (Xe) particles from a Cu(111) surface along the [11̄0] direction under glancing incidence conditions is presented. Inelastic energy losses are neglected. Clear differences between the MD and BCA results are seen in the differential scattering distributions. The origin of these differences arises from approximations in the way "simultaneous" collisions between the projectile and several nearby surface atoms are treated in BCA-type simulations.