通过紫外－ 可见吸收光谱研究了作为 Ｓ Ｅ Ｒ Ｓ衬底的银胶体系在不同情况下的光吸收特性，结果表明检测分子及氯离子的加入均会引起银胶的凝聚，在三者共存情况下由于加入检测分子和氯离子的顺序不同，其吸收光谱存在明显的差异并解释了产生这种差异的原因，同时也证实了在银胶体系中存在“热粒子”和“活位”的合理性 The light absorption properties of the silver colloid system as a substrate of SERS were studied by UV-Vis absorption spectroscopy. The results showed that the addition of both detection molecules and chloride ions caused the aggregation of the silver colloid. In the co-existence of the three Under the different order of addition of detection molecules and chloride ions, there are obvious differences in absorption spectra and explain the reasons for this difference. At the same time, it also confirms the existence of “hot particles” and “live” in the silver colloid system Sex