Abstract
The role of single collision momentum focusing in direct ejection sequences leading to sputtering of atoms from Zr(0001) by 1.5 keV Ar at normal incidence has been investigated using a molecular dynamics simulation. Collisions have been assigned in the simulations and collision sequences leading to sputtering have been classified. The features of the angular distribution obtained for direct ejection sequences are inconsistent with a simple view of single collision momentum focusing in direct ejection sequences. The angular distribution of sputtering is determined more by blocking of exit trajectories of ejecting surface atoms by their nearest neighbors in the surface.
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