Electric field inhibition and promotion of exchange diffusion on Pt(001)

Phys. Rev. Lett. 70, 1631 – Published 15 March 1993
G. L. Kellogg

Abstract

Direct observations of a Pt adatom migrating on the Pt(001) plane in the presence of an externally applied electric field show that a positive field raises, and a negative field lowers, the activation barrier for the adatom–substrate-atom exchange process. At field strengths of 1.5 V/Å and above, inhibition of the exchange mechanism is sufficient to change the diffusion mode from exclusively exchange displacements to a mode that includes hops. The effect of the electric field is explained by an electron-transfer process which changes the bonding of the adatom to neighboring surface atoms.

DOI: http://dx.doi.org/10.1103/PhysRevLett.70.1631

  • Received 17 September 1992
  • Published in the issue dated 15 March 1993

© 1993 The American Physical Society

Authors & Affiliations

G. L. Kellogg

  • Sandia National Laboratories, Albuquerque, New Mexico 87185

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