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Author Jakob, P.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword PHYSICS ♦ MATERIALS SCIENCE ♦ CARBON MONOXIDE ♦ VIBRATIONAL STATES ♦ RUTHENIUM ♦ SORPTIVE PROPERTIES ♦ ADSORPTION ♦ INFRARED SPECTRA ♦ LINE BROADENING ♦ PHONONS ♦ TEMPERATURE DEPENDENCE
Abstract The vibrational spectra of CO adsorbed on Ru(001) have been reinvestigated by infrared absorption spectroscopy at considerably improved sensitivity. A localized two-phonon bound state of the internal stretching mode has been identified. The anharmonicities of the adsorbate vibration have been determined and found to be 18.5 cm{sup {minus}1} for {sup 12}C{sup 16}O and about 17.7 cm{sup {minus}1} for {sup 12}C{sup 18}O and {sup 13}C{sup 16}O, which is about 40{percent} higher than found for the gas phase species. Rapid broadening of the overtone band with increasing temperature is attributed to the thermally activated decay of the two-phonon bound state into single phonon states. {copyright} {ital 1996 The American Physical Society.}
ISSN 00319007
Educational Use Research
Learning Resource Type Article
Publisher Date 1996-11-01
Publisher Place United States
Journal Physical Review Letters
Volume Number 77
Issue Number 20


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