EJECTION OF MOLECULAR CLUSTERS FROM ION-BOMBARDED SURFACES.

Barbara Jane Garrison, Nicholas Winograd, Don E. Harrison

Research output: Contribution to journalArticle

41 Citations (Scopus)

Abstract

We have modeled, using classical dynamics, the dissipation of momentum of a 600-eV Ar** plus 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 similar 5 A. We have also examined oxygen atoms and CO molecules adsorbed on copper and nickel, respectively. For the chemisorbed O atoms, the clusters Cu//2, CuO, O//2, Cu//3, Cu//2O, CuO//2, and O//3 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 ( similar 11 eV). The formation of NiCO and Ni//2CO clusters occurs over the surface.

Original languageEnglish (US)
Pages (from-to)789-792
Number of pages4
JournalJ VAC SCI TECHNOL
Volume16
Issue number2
DOIs
StatePublished - Jan 1 1979

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Ions
Atoms
Copper
Oxygen
Angular distribution
Metals
Dimers
Sputtering
Momentum
Nickel
Single crystals
Molecules
Carbon

All Science Journal Classification (ASJC) codes

  • Engineering(all)

Cite this

Garrison, Barbara Jane ; Winograd, Nicholas ; Harrison, Don E. / EJECTION OF MOLECULAR CLUSTERS FROM ION-BOMBARDED SURFACES. In: J VAC SCI TECHNOL. 1979 ; Vol. 16, No. 2. pp. 789-792.
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EJECTION OF MOLECULAR CLUSTERS FROM ION-BOMBARDED SURFACES. / Garrison, Barbara Jane; Winograd, Nicholas; Harrison, Don E.

In: J VAC SCI TECHNOL, Vol. 16, No. 2, 01.01.1979, p. 789-792.

Research output: Contribution to journalArticle

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AB - We have modeled, using classical dynamics, the dissipation of momentum of a 600-eV Ar** plus 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 similar 5 A. We have also examined oxygen atoms and CO molecules adsorbed on copper and nickel, respectively. For the chemisorbed O atoms, the clusters Cu//2, CuO, O//2, Cu//3, Cu//2O, CuO//2, and O//3 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 ( similar 11 eV). The formation of NiCO and Ni//2CO clusters occurs over the surface.

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