银胶中苯甲酸表面增强拉曼峰强的温度效应

本文测定了银胶中对应于苯甲酸分子不同部分振动模的表面增强拉曼峰强度随温度变化的情形。当温度上升时,表面增强拉曼峰强一般随之降低,但对不同之振动模有着不同的速率。此结果以这样的图象来解释:表面增强拉曼效应是距离(指与银胶颗粒之表面距离)的函数,并且化学与物理机制均起作用,前者为近距离效应而后者为长距离效应。文中半定量地讨论了此二机制对苯甲酸分子不同部分的增强效应的影响。

The Surface Enhanced Effect as revealed from the Temperature Dependent Raman Intensities of Benzoate Molecule in Ag Sol

The surface enhanced Raman (SER) intensities of the modes corresponding to the various portions of the benzoate molecule in the silver Sol are studied as a function of temperature.As the temperature increases,the SER intensities decrease in general, however,with different rates for different modes.This is interpreted in terms of a pic- ture in which the SER effect is distance (away from the sol surface) dependent and that both the chemical and electromagnetic mechtanisms are operative with the former of shorter range and the latter of longer range.The effect of these two mechanisms on the various portions of the adsorbed benzoate molecule is also discussed semi—quantitative- ly.