Raman scattering of laser light has been observed from submonolayer and higher coverages of pyridine deposited at temperatures down to liquid He temperatures on island films of silver in an ultrahigh vacuum chamber. The coverage was monitored by a quartz crystal microbalance. Spectral intensities were found to be independent of the amount of pyridine deposited, implying that the enhancement occurs only for coverages of the order of one monolayer.
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Seki et al. (1980) studied this question.
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