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Journal of Statistical Physics

, Volume 30, Issue 2, pp 537–547 | Cite as

Kinetics of adsorption on stepped surfaces and the determination of surface diffusion constants

  • C. H. Wu
  • E. W. Montroll
Articles

Abstract

Nitrogen adsorption on stepped W(110) surfaces is examined to illustrate a theory of surface kinetics. Experimental findings by Besockeet al. have shown that nitrogen chemisorbs dissociatively only at the step corner sites of a W(110) surface. Thus the rate of dissociation reveals the mobility of nitrogen and its interaction with the surface. Using continuous-time-random-walk theory, we obtain the probability that molecules reach the step corner sites as a function of time. A kinetic model of nitrogen dissociation is proposed to calculate a coverage function that is in good agreement with experiment. The surface diffusion constant of nitrogen molecules is obtained and is in accordance with previous observations that nitrogen molecules are first weakly physisorbed on the W(110) terrace. Finally, the coverage functions for different step densities are predicted.

Key words

Surface diffusions random walks lattices periodic traps dissociation 

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Copyright information

© Plenum Publishing Corporation 1983

Authors and Affiliations

  • C. H. Wu
    • 1
  • E. W. Montroll
    • 2
  1. 1.RCA LaboratoriesUSA
  2. 2.University of MarylandUSA

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