Sputtering of benzene sample by large Ne, Ar and Kr clusters - Molecular dynamics computer simulations

Molecular dynamics simulations are employed to probe the role of an impact angle on emission effciency of organic molecules sputtered from benzene crystal bombarded by 15 keV Ne₂₉₅₃, Ar₂₉₅₃, and Kr₂₉₅₃ clusters. It is found that both the cluster type and the angle of incidence have significant effect on the emission effciency. The shape of the impact angle dependence does not resemble the dependence characteristic for medium size clusters (C₆₀, Ar₃₆₆), where sputtering yield only moderately increases with the impact angle, has a shallow maximum around 40° and then decreases. On the contrary, for the large projectiles (Ne ₂₉₅₃, Ar₂₉₅₃, and Kr₂₉₅₃) the emission effciency steeply increases with the impact angle, has a pronounced maximum around 55° followed by rapid signal decay. It has been found that the sputtering yield is the most sensitive to the impact angle change for Kr cluster projectiles, while change of the impact angle of Ne projectile has the smallest effect on the effciency of material ejection.