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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Kinetics of the Reaction of SH and SD with NO_2
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Kinetics of the Reaction of SH and SD with NO_2

机译：SH和SD与NO_2反应的动力学

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摘要

The rate constants for the reactions of NO_2 with SH and SD were measured between 250 and 360 K to be 2.8 x 10~(-11) exp{(270 +- 40)/T(K)} and 2.6 x 10~(-11) exp{(285 +- 20)/T(K)} cm~3 molecule~(-1) s~(-1),respectively. SH(SD) radicals were generated by pulsed laser photolysis of H_2S(D_2S) or CH_3SH and detected via pulsed laser-induced fluorescence. The laser-induced fluorescence excitation spectrum of SH was found to be contaminated by the presence of the SO radical. This contamination is suggested as a possible reason for differences among some of the reported values of k_1 in the literature. The title reaction influences the atmospheric lifetime of the SH radical when NO_2 is greater than 100 pptv,but the revised value of k_1 does not significantly alter our current understanding of SH oxidation in the atmosphere.
机译：在250和360 K之间测得NO_2与SH和SD反应的速率常数为2.8 x 10〜（-11）exp {（270 +-40）/ T（K）}和2.6 x 10〜（- 11）分别为exp {（285 +-20）/ T（K）} cm〜3分子〜（-1）s〜（-1）。 SH（SD）自由基是通过H_2S（D_2S）或CH_3SH的脉冲激光光解产生的，并通过脉冲激光诱导的荧光进行检测。发现SH的激光诱导的荧光激发光谱被SO自由基的存在所污染。建议将该污染作为文献中某些报告的k_1值之间差异的可能原因。当NO_2大于100 pptv时，标题反应会影响SH自由基的大气寿命，但k_1的修正值不会显着改变我们目前对大气中SH氧化的理解。

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