中文摘要：

用激光光解-激光诱导荧光方法研究了室温下（T=293K）NCF（~X^1A′）自由基与SO2分子的反应动力学．实验中HCF（~X^1A′）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^1A′）自由基的相对浓度随着反应时间的变化，得到此反应的二级反应速率常数为：k=（1．81±0．15）×10^-12cm^3·molecule^-1·s^-1，体系总压为1862Pa．高精度理论计算表明，HCF（~X^1A′）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．

英文摘要：

HCF（~X^1A′） radicals were produced by laser photolysis of HCFBr2 at 213 nm, and electronically excited from the ground state to ~A^1A′（030） at 492.70 nm with a dye laser pumped by a Nd ： YAG laser. The reaction rate constant of HCF（~X^1A′） with SO2 at room temperature （T=293 K） was determined to be k= （1.81±0.15）× 10^-12 cm^3·molecule^- 1·s^-1, when the total pressure was 1862 Pa. Based on the high level ab initio calculations, the mechanism of this reaction was proved to be a typical addition-elimination reaction. The temperature and pressure dependences of the total reaction rate constant were calculated by applying RRKM-TST model. The calculations could provide a well consistent description for our experimental work.