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Classical stochastic diffusion theory for thermal desorption from solid surfaces

Redondo, Antonio and Zeiri, Yehuda and Goddard, William A., III (1984) Classical stochastic diffusion theory for thermal desorption from solid surfaces. Journal of Vacuum Science and Technology B, 2 (3). pp. 550-560. ISSN 1071-1023. http://resolver.caltech.edu/CaltechAUTHORS:REDjvst84

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Abstract

As a first step in the microscopic study of dynamic processes on surfaces and at interfaces, we have considered the thermal desorption of adsorbed species on solid surfaces. We review recent developments based on a classical stochastic diffusion formulation. Using this theory, we obtained a simple rate expression, R=(Omega0/2pi) f(T)exp(–De/kT), where Omega0 is the surface-adsorbate vibrational frequency and De the dissociation energy. For atoms f(T)=1, whereas for molecules f(T) depends on the parameters for the frustrated rotations at the surface. The effect of coverage on the rate of desorption and the process of desorption into a fluid are also examined. Finally, we discuss the relationship between our theory and the expressions obtained from activated complex (transition-state) theory.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1116/1.582837DOIUNSPECIFIED
Additional Information:© 1984 American Vacuum Society. Received 31 January 1984; accepted 24 April 1984. This work was partially supported by the Department of Energy (Contract No. DE-AM03-76SF00767; Project Agreements Nos. DE-AT03-80ER10608 and W-7405ENG-35). [Y.Z. was a] Chaim Weizmann Postdoctoral Fellow.
Funders:
Funding AgencyGrant Number
Department of EnergyDE-AM03-76SF00767
Department of EnergyDE-AT03-80ER10608
Department of EnergyW-7405ENG- 35
Chaim Weizmann FoundationUNSPECIFIED
Subject Keywords:DIFFUSION; SURFACES; INTERFACES; ADSORPTION; DESORPTION; DISSOCIATION; VIBRATIONAL STATES; SORPTIVE PROPERTIES; TEMPERATURE EFFECTS; MATHEMATICAL MODELS; DISSOCIATION ENERGY; FLUIDS
Record Number:CaltechAUTHORS:REDjvst84
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:REDjvst84
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:11313
Collection:CaltechAUTHORS
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Deposited On:30 Jul 2008 23:58
Last Modified:26 Dec 2012 10:12

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