Ultrahigh-Vacuum Studies of Enhanced Raman Scattering from Pyridine on Ag Surfaces

Abstract

Studies of surface-enhanced Raman scattering from pyridine adsorbed on Ag surfaces in ultrahigh vacuum show a strong dependence on both surface roughness and pyridine coverage. The observation of enhancement (${10}^{4}$) for physisorbed pyridine multilayers in addition to the first molecular layer implies that the enhanced effect is electromagnetic rather than chemical in origin.