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We have determined the Raman scattering cross section of pyridine molecules adsorbed on a "smooth" surface of silver prepared and characterized in an ultrahigh-vacuum chamber. The Raman intensity of the 1004-cm^-1 line of adsorbed pyridine was calibrated against the scattering intensity of the same mode from gaseous pyridine and liquid pyridine. The cross section for pyridine molecules adsorbed on a "smooth" silver (100) surface is 4.4 ×{} 10² times greater than that of gaseous and liquid pyridine molecules. This measured cross section is an upper limit for that on a theoretically perfect, flat plane of silver atoms.
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Udagawa et al. (1981) studied this question.
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