Ejection of molecular clusters from ion‐bombarded surfaces
Garrison, Barbara J.
Harrison, Don E., Jr.
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We have modeled, using classical dynamics, the dissipation of momentum of a 600‐eV Ar+ ion as it bombards a metal single crystal. The model correctly predicts relative sputtering yields, secondary particle energy distributions, and angular distributions. In addition, it also gives considerable insight into the mechanism of molecular cluster formation. For the three low index faces of copper, for example, the observed dimers, trimers, and higher multimers form over the surface but within interaction range of the solid. The clusters show rearrangement of their constituent atoms from their original surface positions, but do arise from a localized region of radius ~5 Å. We have also examined oxygen atoms and CO molecules adsorbed on copper and nickel, respectively. For the chemisorbed O atoms, the clusters Cu₂, CuO, O₂, Cu₃, Cu₂O, CuO₂, and O₃ have all been observed to form over the surface, analogous to the clean metal case. For CO, however, most of the ejection occurs molecularly due to the strong carbon–oxygen bond (~11 eV). The formation of NiCO and Ni₂CO clusters occurs over the surface.
The article of record as published may be found at http://dx.doi.org/10.1116/1.570087
RightsThis publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.
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Atomic and molecular ejection from ion-bombarded reacted single-crystal surfaces. Oxygen on copper(100) Garrison, B.J.; Winograd, N.; Harrison, D.E. Jr. (American Physical Society, 1978-12-01);The trajectories of atomic and molecular species ejected from an ion-bombarded reacted single-crystal surface have been calculated using classical dynamics. As a model system, oxygen has been adsorbed in various coverages ...
Harrison, D.E. Jr.; Delaplain, C.B. (American Institute of Physics, 1976);The formation of clusters of sputtered copper atoms from an argon-bombarded (100) copper surface has been simulated with a computer program which includes interatomic attractive forces. Dimer formation is very common. Most ...
Harrison, Don E. Jr.; Moore, W.L. Jr.; Holcombe, H.T (1973);The conclusions of the first paper in this series have been confirmed by simulations in which the copper target is represented by a composite potential function consisting of a Born-Mayer repulsive potential segment, a ...