Role of Surface Thermal Motion in the Dissociative Chemisorption and Recombinative Desorption of D{sub 2} on Ag(111)

Journal Article · Sun Jun 01 00:00:00 EDT 1997 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.78.4458· OSTI ID:530236

Murphy, M J; Hodgson, A ^[1]

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1. Surface Science Research Centre and Department of Chemistry, University of Liverpool, P.O. Box 147, Liverpool L69 3BX (United Kingdom)

Although D{sub 2} dissociation exhibits a large barrier on Ag(111), recombinative desorption occurs with minimal translational energy release. A strong surface temperature dependence is seen with a bimodal energy release at high temperatures. We propose that desorption occurs through two channels: by recombination at thermally activated sites, with a high steric constraint but low activation barrier, and directly via a large barrier at high surface temperatures. Surface thermal motion determines the distribution of dissociation barriers, a model which will be important in other activated systems. {copyright} {ital 1997} {ital The American Physical Society}

• OSTI ID: 530236
• Journal Information: Physical Review Letters, Vol. 78, Issue 23; Other Information: PBD: Jun 1997
• Country of Publication: United States
• Language: English

Related Subjects

40 CHEMISTRY
DEUTERIUM
CHEMISORPTION
SILVER
SORPTIVE PROPERTIES
DISSOCIATION
DESORPTION
RECOMBINATION
TEMPERATURE DEPENDENCE