Surface self-diffusion on Pt(001) by an atomic exchange mechanism

Phys. Rev. Lett. 64, 3143 – Published 25 June 1990
G. L. Kellogg and Peter J. Feibelman

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).

DOI: http://dx.doi.org/10.1103/PhysRevLett.64.3143

  • Received 29 March 1990
  • Published in the issue dated 25 June 1990

© 1990 The American Physical Society

Authors & Affiliations

G. L. Kellogg and Peter J. Feibelman

  • Sandia National Laboratories, Albuquerque, New Mexico 87185

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