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

Paper SS-MoP18
Molecular State Identification of the Adsorbate Present on the Si(111)-(7x7) Surface Reacted with Oxygen. A Cs@super +@ Reactive Scattering Study

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

Session: Surface Science Division Poster Session
Presenter: H. Kang, Pohang University of Science and Technology, South Korea
Authors: K.-Y. Kim, Pohang University of Science and Technology, South Korea
T.-H. Shin, Pohang University of Science and Technology, South Korea
H. Kang, Pohang University of Science and Technology, South Korea
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While the interaction of molecular oxygen with a Si(111)-(7x7) surface has been one of the most actively studied surface reactions, the nature of the surface adsorbate, or the precursor state produced during initial oxidation of the Si surface, is still an open question. Interpretation of the experimental results on this system varies from molecular oxygen, either in the peroxide or superoxide form, to atomic oxygen bonded to various sites of the surface. To this surface we have applied a recently developed technique of Cs@super +@ reactive scattering.@footnote 1,2@ From this investigation we have found that oxygen exists on the surface only in the oxide form, and that the molecular oxygen bonded to a surface does not exist. The present finding allows explanation for many of the controversial issues regarding the initial oxidation mechanism of the Si surface. @FootnoteText@ @footnote 1@ M. C. Yang, C. H. Hwang, and H. Kang, J. Chem. Phys., 107, 2611 (1997). @footnote 2@ H. Kang, K. D. Kim, and K. Y. Kim, J. Am. Chem. Soc., 119, 12002 (1997).