AVS 45th International Symposium
    Surface Science Division Monday Sessions
       Session SS-MoP

Paper SS-MoP2
Adsorption Dynamics of Monoenergetic Oxygen on Al(111)

Monday, November 2, 1998, 5:30 pm, Room Hall A

Session: Surface Science Division Poster Session
Presenter: A.J. Komrowski, University of California, San Diego
Authors: A.J. Komrowski, University of California, San Diego
Y. Liu, University of California, San Diego
A.C. Kummel, University of California, San Diego
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The interaction of oxygen with aluminum has become a prominent system in the study of metal oxidation. An intriguing scanning tunneling microscope (STM) study observed that dissociated O atoms on Al(111) at low coverages are separated by >80 Å when the surface is dosed with thermal O@sub 2@ molecules@footnote 1@. More recently, a detailed energy-resolved sticking probability experiment using supersonic molecular beams reported a strong O@sub 2@ translational energy dependence of the sticking coefficient on Al(111), demonstrating an activated process with no indication of precursor-mediated adsorption@footnote 2@. Further, the sticking measurements suggested that high incident energy O@sub 2@ may access regions of the multipotential energy surface unavailable to thermal O@sub 2@ and therefore chemisorb by a different mechanism. We will present results of the adsorption of monoenergetic O@sub 2@ molecules on the Al(111) surface over a range of incident energies using supersonic molecular beam techniques and STM. We will show how the chemisorption site distribution changes with incident translational energy. @FootnoteText@ @footnote 1@ Brune, H. et. al. J. Chem. Phys. v99, 2128 (1993). @footnote 2@ Österlund, L. et. al. Phys. Rev. B v55, 15452 (1997).