拉曼散射
拉曼光谱
共振(粒子物理)
材料科学
X射线拉曼散射
米氏散射
波长
化学
分析化学(期刊)
相干反斯托克斯拉曼光谱
消光(光学矿物学)
激发
分子物理学
散射
光散射
光学
原子物理学
光电子学
矿物学
物理
量子力学
色谱法
作者
J. A. Creighton,C.G. Blatchford,Merwe Albrecht
出处
期刊:Journal of the Chemical Society
[The Royal Society of Chemistry]
日期:1979-01-01
卷期号:75: 790-790
被引量:1541
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 of intensity enhancement is strongly dependent on the excitation wavelength, with a sharp resonance Raman maximum for excitation at the wavelength of the Mie extinction maximum of the metal particles, and for the silver sols the Raman maximum is shown to follow the extinction maximum to longer wavelengths with increase in particle size. A new resonance Raman phenomenon is thus proposed which is the Raman component of resonant Mie scattering, and in which the polarizability of the metal particles is modulated by the vibrations of the adsorbed molecules. These observations confirm that surface plasma oscillations are involved in the intense Raman scattering already reported for molecules adsorbed at roughened silver surfaces. The metal dielectric function requirements for resonant Mie scattering enable the optimum excitation wavelength for plasma resonance-enhanced Raman studies at the surface of other metals to be estimated.
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