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Physics and AstronomyAtomic and Molecular Physics and Spectroscopy

Vibrational Frequencies of Halogen Atoms Adsorbed on Silver Metal Surfaces.

Authors: Henry Nichols; Robert M. Hexter; MINNESOTA UNIV MINNEAPOLIS DEPT OF CHEMISTRY
Abstract:
The vibrational frequencies of halogens adsorbed on Ag(100) are calculated. The frequency of a single adsorbed atom vibration perpendicular to the surface is obtained from AgX (X = F, Cl, Br, I) crystal frequencies. Interaction between dipoles consisting of the effective charge on the adsorbed atom and its induced image charge produces a coverage dependent frequency. The effective charge on the adsorbed atom is assumed to be 1.0 e, while the electronic polarizability of the real-plus-image atom system is assumed to be twice the electronic polarizability of X-. At full coverage, the calculated frequencies for the k = O modes are 437, 241, 150, and 113/cm respectively for X = F, C, Br, I, which compare well with experimental values, and these frequencies are assigned to external vibrational modes of halogen atoms adsorbed on silver. (Author)

Description: Technical rept.
Pages: 23
Report Date: 17 JUL 1980
Contract Number: N0001477C0209, DAAG2977G0020
Report Number: A466780

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Keywords relating to this report:
*ABSORPTION SPECTRA
*Halogens
*SILVER ALLOYS
*SURFACE CHEMISTRY
*VIBRATIONAL SPECTRA
ATOMS
CRYSTAL STRUCTURE
DIPOLES
ELECTROCHEMISTRY
ELECTRONIC STATES
FREQUENCY
IMAGES
MOLECULAR VIBRATION
POLARIZATION
RAMAN SPECTROSCOPY
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