Abstract

A reaction of the iodine oxide (IO) radical with dimethyl sulfide (DMS) in a temperature range of 291–365 K was studied using atomic iodine resonance fluorescence. It was found that this reaction was mainly heterogeneous under the experimental conditions, and the rate constant of the heterogeneous reaction was almost an order of magnitude higher than the rate constant of a homogeneous reaction. The temperature dependence of the rate constant of this reaction can be represented by the following expression: k(T) = 1.5 × 10^–14 [±3 × 10^–15 cm³ molecule^–1 s^–1] exp(7150[±800 J/mol]/RT). The conditions under which the heterogeneous reaction of DMS with the IO radical can play a noticeable role in the oxidation of DMS in the atmosphere are discussed.

中文翻译：

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在291–365 K的温度范围内二甲基硫与氧化碘的非均相反应

摘要

使用原子碘共振荧光研究了碘氧化物（IO）自由基与二甲基硫醚（DMS）在291–365 K温度范围内的反应。发现该反应在实验条件下主要是非均相的，并且非均相反应的速率常数比均相反应的速率常数几乎高一个数量级。该反应速率常数的温度依赖性可以由以下表达式表示：k（T）= 1.5×10 ^–14 [±3×10 ^–15 cm ³分子^–1 s ^–1 ] exp（7150 [±800 J / mol] / RT）。讨论了DMS与IO自由基的异质反应在大气中DMS氧化中起显著作用的条件。