荧光素钠互变异构体的表面增强共振喇曼散射光谱

本文报导了不同pH值下荧光素钠吸附于银岛膜的表面增强共振喇曼散射(SERRS)光谱。由于在不同pH值的溶液中荧光素钠具有不同的离子构型, 其SERRS光谱也有所不同, 其差异主要表现在谱线强度的变化而不是频率变化。谱线强度随pH值的变化形式可分为两种类型, 这与其相对应的振动模的性质有关。利用“四级能模型”和共振喇曼理论对实验结果进行了分析。

SURFACE-ENHANCED RESONANCE RAMAN SCATTERING SPECTRA OF SODIUM FLUORESCEIN WITH DIFFERENT TAUTOMERS

The SERRS spectra of sodium fluorescein at various pH values adsorbed on silverisland film are presented. Due to the fact that sodium fluorescein exists in different ionic forms in the solutions at different pH values, these SERRS spectra are different. The difference lies not in the freciuency, but in the intensity of Raman bands. The intensity variation of the band with the pH value falls into two categeries depending on the nature of corresponding modes of vibration. The experimental results are interpreted by using a "four-level model" with the theory of resonance Raman scttering.