Dissociative excitation transfer in the reaction of O2(a1Δg) with OH-(H2O)1,2 clusters

被引：12

作者：

Viggiano, Albert A. ^{[3
]}

Midey, Anthony ^{[3
]}

Eyet, Nicole ^{[4
]}

Bierbaum, Veronica M. ^{[4
]}

Troe, Juergen ^{[1
,2
]}

机构：

[1] Univ Gottingen, Inst Phys Chem, D-37077 Gottingen, Germany

[2] Max Planck Inst Biophys Chem, D-37077 Gottingen, Germany

[3] USAF, Res Lab, Space Vehicles Directorate, Hanscom AFB, MA 01731 USA

[4] Univ Colorado, Dept Chem & Biochem, Boulder, CO 80309 USA

来源：

JOURNAL OF CHEMICAL PHYSICS | 2009年 / 131卷 / 09期

基金：

美国国家科学基金会;

关键词：

dissociation; molecular clusters; molecule-molecule reactions; oxygen; reaction kinetics theory; reaction rate constants; water; TEMPERATURE DEPENDENCES; TRANSLATIONAL ENERGY; IONS; TRANSITION; HYDRATION; O-2(-); SHELL;

D O I：

10.1063/1.3212839

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：

Rate constants for the dissociation of OH-(H2O) and OH-(H2O)(2) by transfer of electronic energy from O-2(a(1)Delta(g)) were measured. Values of 1.8x10(-11) and 2.2x10(-11) cm(3) molecule(-1) s(-1), respectively, at 300 K were derived and temperature dependences were obtained from 300 to 500 K for OH-(H2O) and from 300 to 400 K for OH-(H2O)(2). Dissociative excitation transfer with OH-(H2O) is slightly endothermic and the reaction appears to have a positive temperature dependence, but barely outside the uncertainty range. In contrast, the reaction of OH-(H2O)(2) is exothermic and appears to have a negative temperature dependence. The rate constants are analyzed in terms of unimolecular rate theory, which suggests that the dissociation is prompt and is not affected by collisions with the helium buffer gas.

引用

页数：6

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