Elsevier

Surface Science

Volume 106, Issues 1–3, 1 May 1981, Pages 345-349
Surface Science

First-order Raman scattering induced by Na and Ag colloids in NaCl, NaBr and NaI

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Abstract

Resonance Raman studies of metal colloids (Na, Ag) in sodium halides (NaCl, NaBr, NaI) are reported, as a function of particle size and excitation wavelength. Strong Raman peaks are observed as opposed to second-order spectra of host crystals. In the case of NaBr and NaI, a gap of frequencies is observed in Raman spectra, in accordance with the phonon dispersion curves of the pure crystals. Raman bands come from excitation of modes at the interface colloid-host crystal through surface plasmons.

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Equipe de Recherche Associée au CNRS No. 13.

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