激光光解自由基的TR-ESR研究

摘要

Time-resolved electron spin resonance (TR-ESR) is a powerful technique which can be used to detect and identify short-lived intermediates in photo-induced reaction. The chemically induced dynamic electron polarization (CIDEP) signal measured by the TR-ESR technique can provide rich information on the mechanism and dynamics of photochemical reaction. In this review, the four CIDEP mechanisms and the home-made TR-ESR with balance reflection bridge-type circuit and zero difference beat balance mixing frequency model are introduced. The applications of TR-ESR in investigation on laser photolyzed radicals are summarized.%时间分辨电子自旋共振(TR-ESR)技术是探测和鉴定光化学反应过程中顺磁性中间体的强有力工具,利用TR-ESR技术观察到的化学诱导动态电子极化(CIDEP)可以为我们提供丰富的光化学反应机理、反应动力学等信息.该文较为详细地介绍了CIDEP的4种机理和自行研制的一种零差拍平衡混频的时间分辨ESR波谱仪,总结了TR-ESR技术在光解自由基反应方面的应用.