AVS 45th International Symposium
    Surface Science Division Friday Sessions
       Session SS2-FrM

Paper SS2-FrM7
Interaction of Water and Dimethyl Sulfoxide with Gold Surfaces

Friday, November 6, 1998, 10:20 am, Room 309

Session: Water and Ice Interfaces
Presenter: A.A. Gewirth, University of Illinois, Urbana
Authors: A.A. Gewirth, University of Illinois, Urbana
N. Ikemiya, University of Illinois, Urbana
S.K. Si, University of Illinois, Urbana
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We discuss recent results examining the initial stages of water and dimethyl sulfoxide adsorbtion on Au surfaces. We show that water first adsorbs on Au at low temperature as a planar, amorphous, monolayer-high film. The subsequent growth of water clusters occurs atop this film, but not on the bare metal surface. The growth and structure of dimethyl sulfoxide on Au surfaces is surface-structure dependent with more highly corrugated faces providing localized electron density yielding ordered arrays. Results obtained at room temperature from bulk liquid dimethyl sulfoxide are in close correspondance with low temperature UHV measurements.