Abstract
Surface-enhanced hyper-Raman scattering by pyridine was observed in aqueous silver citrate sols. Surface enhancement factors of several pyridine vibrations were measured and range from 10{sup 3} to 10{sup 6}. The strongest enhancements were observed in the totally symmetric vibrations {nu}{sub 12}, {nu}{sub 1}, {nu}{sub 6e}, and {nu}{sub 8a} and the b{sub 2} vibration {nu}{sub 6b}. The surface enhancements observed are larger than predicted by electrodynamic theories of surface enhancement for simple spherical or spheriodal particles, but relative enhancements are consistent with electromagnetic surface enhancement selection rules for hyper-Raman scattering. Elastic incoherent scattering in Ag sols was observed at twice the laser frequency. The intensity of the elastic component was 10{sup 4} to 10{sup 6} times more intense than hyper-Rayleigh scattering from bulk pyridine and increased upon addition of pyridine to the silver sols.
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