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用电子自旋共振波谱方法研究了半导体超微粒子表面光诱导电子转移所引发的底物的次级自由基反应动力学过程．结果表明，用含有水溶性草酸盐的硫化镉（ＣｄＳ）胶体体系产生的ＣＯＯ－·离子基，可以较方便地引发其它自由基反应，并根据已知的由ＤＭＰＯ捕捉ＣＯＯ－·的反应速度常数数据，去计算ＣＯＯ－·基与其它可产生稳定自由基的化合物进行反应的速度常数值，从而在此基础上发展了一种研究自由基反应动力学的行之有效的简便的新途径和新方法，可以较广泛地应用于其它凝聚相的自由基反应动力学体系的研究．
The electron-spin resonance spectroscopy was used to study the secondary radical reaction kinetics of the substrate induced by light-induced electron transfer on the surface of semiconductor ultrafine particles. The results show that other free radical reactions can be initiated more easily with the COO- · ion groups generated by the cadmium sulfide (CdS) colloidal system containing water-soluble oxalate, and according to the known reaction rate of capturing COO- · by DMPO Constant data to calculate the rate constants of reaction of COO- · group with other compounds that can generate stable free radicals. Based on this, we have developed an effective and convenient new way to study the reaction kinetics of free radicals. The new method can be widely applied to other condensed radical reaction kinetics system.