Energy redistribution among internal states of nitric oxide molecules upon scattering from Pt(111) crystal surface

M. Asscher*, W. L. Guthrie, T. H. Lin, G. A. Somorjai

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

119 Scopus citations

Abstract

The internal states distributions rotation and vibration of nitric oxide molecules scattered from the Pt(111) crystal surface are reported. These distributions were measured as a function of crystal temperature (Ts) and scattering angles. The extent of equilibration of the three degrees of freedom, e.g., translation, rotation, and vibration with the metal surface is discussed in terms of the energy accommodation coefficients γ. It was found that γtransvibrot. A model is suggested to account for the cold rotational distribution of molecules scattered via a trapping desorption mechanism. The vibrational distributions are determined by kinetic effects and by the competition between vibrational excitation of the adsorbed molecules and their desorption.

Original languageEnglish
Pages (from-to)6992-7004
Number of pages13
JournalThe Journal of Chemical Physics
Volume78
Issue number11
DOIs
StatePublished - 1983
Externally publishedYes

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