AVS 46th International Symposium
    Surface Science Division Tuesday Sessions
       Session SS3-TuA

Paper SS3-TuA6
Influence of Adsorbates on the Self-diffusion of Pt Adatoms and the Stability of Pt Dimers

Tuesday, October 26, 1999, 3:40 pm, Room 607

Session: Diffusion on Surfaces
Presenter: S. Horch, University of Aarhus, Denmark
Authors: S. Horch, University of Aarhus, Denmark
T.R. Linderoth, University of Aarhus, Denmark
S. Helveg, University of Aarhus, Denmark
L. Petersen, University of Aarhus, Denmark
E. Laegsgaard, University of Aarhus, Denmark
I. Stensgaard, University of Aarhus, Denmark
F. Besenbacher, University of Aarhus, Denmark
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Surface diffusion of atoms is an important phenomenon in areas of materials processing such as chemical vapor deposition (CVD) and sintering. In these particular areas, the diffusion are modified by atoms adsorbed from the gas phase. Here we try to derive mechanistic insight into this effect from observations, using the Scanning Tunneling Microscope, of adsorbate promoted self-diffusion on the Pt(110)-(1x2) surface.@footnote 1@ In the case of hydrogen, we directly image an activated Pt-H complex (with H bound on top the Pt adatom) which has a diffusivity enhanced by a factor of 500 at room temperature, relative to Pt adatoms on the clean surface. The influence of other adsorbates also on the binding energy of Pt dimers is currently being investigated. @FootnoteText@ @footnote 1@ S. Horch, H. T. Lorensen, S. Helveg, E. Laegsgaard, I. Stensgaard, K. W. Jacobsen, J. K. Norskov and F. Besenbacher, Nature 398 (1999) 134.