Kinetic studies of the reactions of BrO and IO radicals

被引:29
作者
Laszlo, B
Huie, RE
Kurylo, MJ
Miziolek, AW
机构
[1] USA, RES LAB, ABERDEEN PROVING GROUND, MD 21005 USA
[2] NATL INST STAND & TECHNOL, DIV CHEM KINET & THERMODYNAM, CHEM SCI & TECHNOL LAB, GAITHERSBURG, MD 20899 USA
关键词
D O I
10.1029/96JD00458
中图分类号
P4 [大气科学(气象学)];
学科分类号
0706 ; 070601 ;
摘要
The 193-nm laser photolysis of Br-2/N2O mixtures in N-2 buffer has been utilized to determine the absorption cross section of BrO and to study the reactions of O(P-3) with Br-2, O(P-3) with BrO, and the self reaction of BrO at room temperature. The measured kinetic data are in good agreement with the literature values. Molecular bromine formation in the self-reaction of BrO can be described by the concerted steps of Br+BrO-->BrOBr and Br+BrOBr-->Br-2+BrO. From a curve fitting of the simultaneously monitored BrO and IO decays in the Br-2/I-2/N2O system, room temperature rate constants for the BrO+IO-->Products and I+BrO-->IO+Br reactions of (6.9+/-2.7)x10(11) cm(3)/molecule/s and (1.2+/10.6)x10(-11) cm(3)/molecule/s, respectively, were derived. Similar experiments using IBr, instead of Br-2/I-2, revealed a marked sensitivity of the rate constant analysis to the accessible ratio of radical concentrations. Kinetic analysis of this complex reaction system is presented.
引用
收藏
页码:1523 / 1532
页数:10
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