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用激光光解-激光诱导荧光方法研究了室温下(T=293K)HCF(X%A′)自由基与SO2分子的反应动力学.实验中1HCF(X%A′)自由基是由213nm激光光解HCFBr2产生的,用激光诱导荧光(LIF)检测HCF(X%A′)自由基的相对浓度随着11反应时间的变化,得到此反应的二级反应速率常数为:k=(1.81±0.15)×10-12cm3?molecule-1?s-1,体系总压为1862Pa.高精度理论计算表明,HCF(X%A′)和SO2分子反应的机理是典型的加成-消除反应.我们运用RRKM-TST理论计算了1此二级反应速率常数的温度效应和压力效应,计算结果和室温下测定的二级反应速率常数符合得较好.
The reaction kinetics of HCF (X% A ’) radical with SO2 at room temperature (T = 293K) was studied by laser photolysis-laser induced fluorescence method. 1HCF (X% A’ The second-order reaction rate constant for photolysis of HCFBr2 with HCF (X% A ’) by laser-induced fluorescence (LIF) as a function of reaction time was: k = (1.81 ± 0.15) × 10-12cm3 · molecule-1 · s-1, the total pressure of the system is 1862Pa. The theoretical calculation of high precision shows that the mechanism of reaction between HCF (X% A ’) and SO2 is a typical addition-elimination reaction. The temperature effect and pressure effect of the second-order reaction rate constant are calculated by the RRKM-TST theory. The calculated results are in good agreement with the second-order reaction rate constant measured at room temperature.