This Letter reports the first ultrahigh-vacuum study of surface-enhanced Raman scattering from pyridine adsorbed on a clean single-crystal silver surface containing a smooth modulation (1 {μ}m periodicity) to allow optical coupling to surface plasmon polaritons. A large mode-selective enhancement ({~}10⁴) of the Raman signal from the first monolayer is observed at surface-plasmon-polariton resonance. Coverages greater than one monolayer show a smaller enhancement ({~}10²).
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Sanda et al. (1980) studied this question.
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