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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Reaction of HO_2 with ClO: Flow Tube Studies of Kinetics and Product Formation between 215 and 298 K
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Reaction of HO_2 with ClO: Flow Tube Studies of Kinetics and Product Formation between 215 and 298 K

机译：HO_2与ClO的反应：215和298 K之间流动力学和产物形成的流管研究

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摘要

Rate coefficients for the reaction between HO_2 and ClO radicals were obtained using the discharge-flow/mass-spectrometry technique at total pressures of 1.1-1.7 Torr of He, and between 298 and 215 K. The room-temperature rate constant, determined using seven different ccmbinations of HO_2 and ClO precursors, was found to be (7.1 +- 1.8)×10~(-12) (+-2#sigma#) cm~3 s~(-1). The temperature-dependent overall reaction rate coefficient is described by k_(3) (298-215 K) = (7.1+-0.4)×10~(-12) exp(-16+-17/T) cm~3 s~(-1). The previous observation of a strong negative temeprature dependence in the title reaction below 298 K was not observed, resulting in a significantly lower rate coefficient at stratospheric tempertures. HOCl was the only product of the reaction, and an upper limit of 1% for the branching ratio for the formation of O_3 and HCl was obtained at the low pressures of these experiments.
机译：在总压力为1.1-1.7 Torr的He和298至215 K之间的条件下，采用放电/质谱技术获得HO_2与ClO自由基之间反应的速率系数。室温速率常数由7确定发现HO_2和ClO前体的不同结合为（7.1 +-1.8）×10〜（-12）（+ -2＃sigma＃）cm〜3 s〜（-1）。温度相关的总反应速率系数由k_（3）（298-215 K）=（7.1 + -0.4）×10〜（-12）exp（-16 + -17 / T）cm〜3 s〜来描述（-1）。先前未观察到低于298 K的标题反应中强烈的对映体依赖性的观察，导致平流层温度下的速率系数明显降低。 HOCl是反应的唯一产物，在这些实验的低压下，形成O_3和HCl的支化比的上限为1％。

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