Probing the Surface Brillouin Zone by Infrared Absorption Spectroscopy: Asymmetric Line Shape of Vibrational Combination Band

Journal Article · Thu May 01 00:00:00 EDT 1997 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.78.3503· OSTI ID:496810

Jakob, P ^[1]; Persson, B ^[2]

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1. Physik-Department E 20, Technische Universitaet Muenchen, D-85747 Garching (Germany)
2. Institute fuer Festkoerperforschung, Forschungszentrum Juelich, D-52425 Juelich (Germany)

The combination band of the C-O and the Ru-CO stretch vibrational modes of CO adsorbed on Ru(001) has been used to study vibrational dispersion effects by infrared absorption spectroscopy. For an ordered CO layer both vibrational modes can be excited far from the {Gamma} point while fulfilling the {bold q}{approx}0 condition through {bold q} vector matching. It is found that diluted layers lacking intermolecular interactions display a symmetrical and narrow line shape which broadens substantially for the ({radical}(3){times}{radical}(3))R30{degree}CO layer and displays a pronounced asymmetry, in good agreement with theory. {copyright} {ital 1997} {ital The American Physical Society}

• OSTI ID: 496810
• Journal Information: Physical Review Letters, Vol. 78, Issue 18; Other Information: PBD: May 1997
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
RUTHENIUM
ELECTRONIC STRUCTURE
CARBON MONOXIDE
INFRARED SPECTRA
ADSORPTION
VIBRATIONAL STATES
BRILLOUIN ZONES
ABSORPTION SPECTRA
INTERMOLECULAR FORCES