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Molecular Dynamics Simulations of Energetic Ar Cluster Bombardment of Ag(111)

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Palka G., Rzeznik L., Paruch R., Postawa Z.
Acta Physica Polonica A
|
2013
|
vol. 123
|
issue 5
831-833
EN
Large-scale molecular dynamics computer simulations are used to investigate the dynamics of material ejection during high-energy Ar_n cluster bombardment of Ag(111) at normal incidence. The silver sample containing 7 million atoms is bombarded with Ar_n projectiles (n=45-30000) with kinetic energy spanning from a few keV up to 1 MeV. Such a wide range of projectile parameters allows probing processes taking place during low-density collision cascade as well as during high-density events characteristic of micrometeorite bombardment in space. The material modifications and total sputtering yield of ejected particles are investigated. While at low-energy impacts, ejection of individual silver atoms is the main emission channel, the ejection of large clusters from the corona of the created crater dominates for the high-energy impacts.
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