Kinetics of the reaction of OH with HI between 246 and 353 K

被引：22

作者：

Campuzano-Jost, P ^{[1
]}

Crowley, JN ^{[1
]}

机构：

[1] Max Planck Inst Chem, Div Atmospher Chem, D-55020 Mainz, Germany

来源：

JOURNAL OF PHYSICAL CHEMISTRY A | 1999年 / 103卷 / 15期

关键词：

D O I：

10.1021/jp984321x

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The laser-flash photolysis technique combined with resonance fluorescence detection of OH was used to investigate the kinetics of the title reaction at temperatures between 246 and 353 K and at a total pressure of 75 +/- 1 Torr Ar. Under these conditions the rate coefficient shows a negative temperature dependence which is described by k(4)(246-353 K) = 7.0(-0.4)(+1.9) x 10(-11)(T/298)(-1.5+/-0.5) cm(3) s(-1). Both the large rate coefficient and trends in the reactivity of OH with HCl, HBr, and HI are suggestive of a reaction mechanism that proceeds without a significant activation barrier. The room temperature (294 K) rate constant is k(4) = 6.5(-0.4)(+2) x 10(-11) cm(3) s(-1), which is significantly larger than previous measurements. Reasons for this difference and the implications of the new rate coefficients for the lifetime of HI in the atmosphere are discussed.

引用

页码：2712 / 2719

页数：8

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