Quantum theory of IR spectroscopy of dipole-forbidden vibrational modes of adsorbed molecules on the surface of a metal in the frequency range of the anomalous skin effect
- Samara State Technical Univ. (Russian Federation)
- Institut fuer Festkoerperforschung, Juelich (Germany)
A completely quantum-mechanical calculation of the IR spectrum for the dipole-forbidden vibrational modes of adsorbed molecules on a metal surface is performed. IT is shown for broad-band metals with a simple band structure that the asymmetry of the line shape is determined by nonlocal effects, while the nonadiabaticity makes a small contribution. In the region of the limiting anomalous skin effect ({omega}/{omega}{sub 1}{much_lt} 1, where {omega} is the frequency of the IR radiation, {omega}{sub 1}={upsilon}{sub F}/{delta}, {upsilon}{sub F} is the Fermi velocity, {delta}=c/{omega}{sub p} is the depth of the skin layer, and {omega}{sub p} is the plasma frequency) the broad-band absorption spectrum caused by the adsorbed molecules has an asymptotic limit {omega}{sup O}. The theory is compared with new absolute measurements of the IR spectrum of the CO/Cu(100) system. 20 refs., 2 figs.
- OSTI ID:
- 274034
- Journal Information:
- Journal of Experimental and Theoretical Physics, Vol. 81, Issue 3; Other Information: PBD: Sep 1995; TN: Translated from Zhurnal Eksperimental`noi i Teoreticheskoi Fiziki; 108: No. 3, 990-1003(Sep 1995)
- Country of Publication:
- United States
- Language:
- English
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