Abstract
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-${\mathrm{cm}}^{\ensuremath{-}1}$ 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 \ifmmode\times\else\texttimes\fi{} ${10}^{2}$ 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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