Surface self-diffusion on Pt(001) by an atomic exchange mechanism
- 25 June 1990
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 64 (26) , 3143-3146
- https://doi.org/10.1103/physrevlett.64.3143
Abstract
Field-ion microscopy has been used to map the surface sites visited by an individual Pt adatom migrating at 175 K on the Pt(001) plane and to determine its activation energy for surface diffusion. Atomic displacements are found to occur only in the [100] or [010] directions. A surprisingly low activation energy of 0.47 eV is measured. These results are consistent with a model in which the diffusion occurs by an adatom-substrate exchange mechanism. This mechanism is predicted theoretically for self-diffusion on Al(001).Keywords
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