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Summary Abstract: A theoretical study of the effect of lateral interactions on molecular adsorption and desorption

Hood, E. S. and Toby, B. H. and Weinberg, W. H. (1985) Summary Abstract: A theoretical study of the effect of lateral interactions on molecular adsorption and desorption. Journal of Vacuum Science and Technology A, 3 (3). pp. 1564-1565. ISSN 0734-2101. http://resolver.caltech.edu/CaltechAUTHORS:HOOjvsta85

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Abstract

The effect of lateral interactions between coadsorbed molecules on adsorbate island growth and the kinetics of adsorption and desorption have been studied within the constraints of a lattice gas model incorporating a combination of deterministic rate equations with a stochastic formulation. The adsorption and desorption of molecular nitrogen on Ru(001) has been investigated in detail. Recent experiments performed at 77 K reveal an unusual functional dependence of the probability of adsorption which displays a maximum at a coverage of approximately 0.2 monolayer [1,2]. EEL spectra indicate chemisorption of molecular nitrogen occurs only at atop sites with the molecular axis oriented perpendicular to the surface plane [2]. Saturation coverage is achieved at approximately 0.5 monolayer [1,2]. Thermal desorption spectra suggest the presence of two distinct chemisorption states at coverages greater than 0.25 monolayer. Quantitative agreement between calculated and experimental thermal desorption spectra as well as the coverage-dependent probability of adsorption is obtained.


Item Type:Article
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http://dx.doi.org/10.1116/1.573173UNSPECIFIEDUNSPECIFIED
Additional Information:© 1985 American Vacuum Society. Received 1 November 1984; accepted 13 January 1985. Supported by the National Science Foundation under Grant No. CHE82-06487. [E.S.H. was a] Bantrell Postdoctoral Fellow.
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Funding AgencyGrant Number
National Science FoundationCHE82-06487
Bantrell FoundationUNSPECIFIED
Record Number:CaltechAUTHORS:HOOjvsta85
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:HOOjvsta85
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ID Code:12609
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Deposited On:15 Dec 2008 19:07
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