中文摘要：

利用瞬态吸收光谱技术研究了不同条件下C6H5Cl与H2O2水溶液的激光闪光光解情况，初步考察了其瞬态物种的生长和衰减等行为．研究表明，·OH自由基和C6H5Cl反应生成C6H5Cl-OH adduct，其反应速率常数在近中性、酸性条件下约为（5．89±0．65）×10^9和（7．07±0．61）×10^9Lomol^-1·s^-1；其衰减则符合双分子二级反应，速率常数21del=1．1×10^6 s^-1，而在碱性时则为（4．344-0．51）×10^9L·mol^-1·s^-1，衰减呈准一级反应，速率常数为2．11×10^5s^-1．在有氧条件下，O2与C6H5Cl-OH adduct反应生成C6H5Cl—OHO2 adduct，其反应速率常数为6．8×10^8L·mol^-1·s^-1．

英文摘要：

The reaction microscopic mechanism of chlorobenzene with hydrogen peroxide in aqueous solutions under different conditions was studied by laser flash photolysis. The main characteristic peaks in these transient absorbance spectra were assigned and the build-up/decay trends of several transient species were investigated. OH free radical can be produced through the 266 nm laser flash photolysis of hydrogen peroxide in aqueous solutions. The reaction of OH free radical and chlorobenzene produces C6HsCl-OH adduct with a rate constant of （5.89±0.65）×10^9 （L·mol^-1·s^-1） in the approximately neutral solution （pH≈6） or （7.07 ±0.61）×10^9L·mol^-1·s^-1 in acid （pH： 1.5） solution, while its rate constant is about （4.34±0.51）×10^9 （L·mol^-1·s^-1） in the basic （pH=9） solution. In the approximately neutral solution （pH≈6） or in acid （pH = 1.5） solution, the intermediate can decay from itself gradually through a second-order reaction with 2κ/εl=1.1×10^6 s^-1. While in the basic （pH=9） solution, its decay trend shows pseudo-first-order rate constant of 2.11×10^5 s^-1. The C6H5Cl-OH adduct will be able to react with O2 to form C6H5Cl-OHO2.