Computational study on interatomic potentials to dynamic effects in rainbow scattering under axial channeling at Al(0 0 1) surface

Abstract

The interatomic potentials between projectiles and target atoms have a strong influence on the rainbow angles corresponding to pronounced peaks in the angular distributions of scattered projectiles with slight angle, attributed to rainbow scattering (RS), under axial surface channeling conditions. Schüller and Winter (SW) (2009) have measured the dependence of rainbow angles on normal energies to the target surface of projectile energy in RS of reactive N atomic projectile under <1 0 0> axial channeling conditions at a Al(0 0 1) metal surface with projectile energies of 10–70 keV. The SW’s data were analyzed by computer simulations using the ACOCT code based on the binary collision approximation with interatomic pair potentials. The agreement between the ACOCT results using the ZBL pair potential with only a repulsive part and the experimental ones was found in RS for projectile energy of 70 keV. The experimental results included the dynamic effects indicating that rainbow angles increase with decreasing projectile energies at low normal energies were roughly reproduced by the ACOCT simulations for the HF-like pair potentials with an attractive part depending on projectile energies.