Campus Units

Physics and Astronomy, Mathematics, Ames Laboratory

Document Type

Article

Publication Version

Published Version

Publication Date

1988

Journal or Book Title

Physical Review B

Volume

37

Issue

15

First Page

8598

Last Page

8611

DOI

10.1103/PhysRevB.37.8598

Abstract

During chemisorption, islands often form in which adspecies have superlattice spacing. Upon meeting, these coalesce if in phase, and form a domain boundary otherwise. Manifestly nonequi- librium island distributions can develop as a result of kinetic limitations, and a metastable saturation state of domain boundaries may, in turn, result. We analyze irreversible cooperative filling models for the formation of c(2×2) islands, where island structure is kinetically determined, and extensive coalescence near saturation produces a ‘‘percolative’’ domain structure. We show that the associated dramatic increase in domain size, and fractal domain structure, are not reflected in the spatial pair-correlation or diffracted-intensity behavior. Consequently, we identify quasi-one-dimensional measures of domain size which better reflect correlation-length behavior. These are then used to develop scaling relations for pair correlations and diffracted intensities. A special case of our model describes metastable c(2×2)O/Fe(001) formed after exposure of Fe(001) to H2O.

Comments

This article is published as Evans, J. W., R. S. Nord, and J. A. Rabaey. "Nonequilibrium c (2× 2) island formation during chemisorption: Scaling of spatial correlations and diffracted intensity." Physical Review B 37, no. 15 (1988): 8598, doi:10.1103/PhysRevB.37.8598. Posted with permission.

Copyright Owner

American Physical Society

Language

en

File Format

application/pdf

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