C_2H_3+NO_2反应速率常数的研究

Study on the Rate Constant of the Reaction of C_2H_3 Radical with Nitric Dioxide

利用激光光解C2H3Br产生C2H3自由基,在气相298K,总压2.66×103Pa的条件下,研究C2H3与NO2的反应,用激光光解-激光诱导荧光(LP-LIF)检测中间产物OH自由基的相对浓度随着反应时间的变化关系,报导了双分子反应C2H3+NO2的速率常数kC2H3+NO2=(1.8±0.05)×10-11cm3·molec.-1·s-1,同时也得到OH+NO2反应的速率常数kOH+NO2=(2.1±0.15)×10-12cm3·molec.-1·s-1.

The product formation of the reaction of C2H3 radical with NO2 was studied in the gas phase under 2.66 x 10(3)Pa total pressure and 298 K. C2H3 radical was generated by laser photolysis of C2H3Br/Ar mixture. In the presence of nitric dioxide (NO2), the formation of OH radicals of the electronic ground states was monitored by laser-induced fluorescence. From the results of time resolved measurements of the OH radical concentrations, bimolecular rate constants for the reactions C2H3 + NO2 and OH (X-2 II) + NO2 were determined as k(C2H3 + NO2) = (1.8 +/- 0.05) x 10(-11) cm(3) (.) molec.(-1 .) s(-1) and k(OH + NO2) = (2.1 +/- 0.15) X 10(-12) cm(3) (.) molec(.-1 .) s(-1).