Kinetics of Adsorption on Stepped Surfaces and the Determination of Surface Diffusion Constants
Nitrogen adsorption on stepped W(110) surfaces is examined to illustrate a theory of surface kinetics. Experimental findings by Besocke et 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.
C. Wu and E. W. Montroll, "Kinetics of Adsorption on Stepped Surfaces and the Determination of Surface Diffusion Constants," Journal of Statistical Physics, vol. 30, no. 2, pp. 537-547, Kluwer Academic Publishers, Feb 1983.
The definitive version is available at http://dx.doi.org/10.1007/BF01012327
Electrical and Computer Engineering
Keywords and Phrases
Dissociation; Lattices; Periodic Traps; Random Walks; Surface Diffusions
International Standard Serial Number (ISSN)
Article - Journal
© 1983 Kluwer Academic Publishers, All rights reserved.