Plasma resonance enhancement of Raman scattering by pyridine adsorbed on silver or gold sol particles of size comparable to the excitation wavelength

摘要: Intense Raman scattering by pyridine molecules adsorbed on silver or gold aqueous sol particles of dimensions comparable to the wavelength is reported. The degree intensity enhancement strongly dependent excitation wavelength, with a sharp resonance maximum for at Mie extinction metal particles, and sols shown follow longer wavelengths increase in particle size. A new phenomenon thus proposed which component resonant scattering, polarizability modulated vibrations molecules. These observations confirm that surface plasma oscillations are involved intense already reported roughened surfaces. dielectric function requirements enable optimum resonance-enhanced studies other metals be estimated.