Rate Theory for Correlated Processes: Double Jumps in Adatom Diffusion

J. Jacobsen, Karsten Wedel Jacobsen, J. Sethna

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Abstract

We study the rate of activated motion over multiple barriers, in particular the correlated double jump of an adatom diffusing on a missing-row reconstructed platinum (110) surface. We develop a transition path theory, showing that the activation energy is given by the minimum-energy trajectory which succeeds in the double jump. We explicitly calculate this trajectory within an effective-medium molecular dynamics simulation. A cusp in the acceptance region leads to a root T prefactor for the activated rate of double jumps. Theory and numerical results agree.
Original languageEnglish
JournalPhysical Review Letters
Volume79
Issue number15
Pages (from-to)2843-2846
ISSN0031-9007
DOIs
Publication statusPublished - 1997

Bibliographical note

Copyright (1997) by the American Physical Society.

Keywords

  • SURFACE-DIFFUSION
  • MIGRATION
  • HOPS
  • LONG JUMPS

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