Kinetic study of the reaction of OH with CH3I revisited
Kinetic study of the reaction of OH with CH3I revisited
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重新审视 OH 与 CH3I 反应的动力学研究
DOI：
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发表时间：
2011
期刊：
影响因子：
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通讯作者：
C. Zetzsch
中科院分区：
文献类型：
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作者：
Shaoliang Zhang;R. Strekowski;L. Bosland;A. Monod;C. Zetzsch
用闪光光解共振荧光技术研究了295-390 K和82-303 Torr He气压范围内OH（X2）自由基与CH_3 I反应的动力学和机理。实验涉及在H2O/CH 3 I/He混合物的FP之后的OH（λ = 308 nm处的A2 π + → X2Π跃迁）的时间分辨RF检测。用Perkin-Elmer紫外闪光灯，在波长λ > 115 nm的真空紫外光下，通过水的FP产生OH（X2）自由基。OH在CH 3 I存在下的衰减被观察到是指数的，并且发现衰减速率与CH 3 I浓度成线性关系。OH与CH 3 I反应的速率系数可以用阿雷尼乌斯公式kOH+ CH 3 I =（4.1 ± 2.2）× 10−12 exp [（−1240 ± 200）K/T] cm 3 molecule− 1 s −1来描述。了解大气和核工业利益的CH 3 I化学的动力学结果的影响进行了讨论。© 2011 Wiley Periodicals，Inc. Int J Chem Kinet 43：547-556，2011
A flash photolysis resonance fluorescence technique has been employed to investigate the kinetics and mechanism of the reaction of OH(X2Π) radicals with CH3I over the temperature and pressure ranges 295–390 K and 82–303 Torr of He, respectively. The experiments involved time-resolved RF detection of the OH (A2Σ+ → X2Π transition at λ = 308 nm) following FP of H2O/CH3I/He mixtures. The OH(X2Π) radicals were produced by FP of H2O in the vacuum-UV at wavelengths λ > 115 nm using a commercial Perkin-Elmer Xe flash lamp. Decays of OH in the presence of CH3I are observed to be exponential, and the decay rates are found to be linearly dependent on the CH3I concentration. The measured rate coefficients for the reaction of OH with CH3I are described by the Arrhenius expression kOH+CH3I = (4.1 ± 2.2) × 10−12 exp [(−1240 ± 200)K/T] cm3 molecule−1s−1. The implications of the reported kinetic results for understanding the CH3I chemistry of both atmospheric and nuclear industry interests are discussed. © 2011 Wiley Periodicals, Inc. Int J Chem Kinet 43: 547–556, 2011