Third-body dependence of rate coefficients for ozone formation in 16O-18O mixtures

被引：33

作者：

Guenther, J ^{[1
]}

Krankowsky, D ^{[1
]}

Mauersberger, K ^{[1
]}

机构：

[1] Max Planck Inst Kernphys, Div Atmospher Phys, D-69029 Heidelberg, Germany

来源：

CHEMICAL PHYSICS LETTERS | 2000年 / 324卷 / 1-3期

关键词：

D O I：

10.1016/S0009-2614(00)00550-9

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：

Two ozone rate coefficient ratios have been measured in different bath gases that include noble gases, O-2/N-2 mixtures as well as CH4 and CO2. While absolute rate coefficients for ozone formation differ by a factor of four between Ar and CO2 the rate coefficient ratios for O-16 + (OO)-O-18-O-18/O-16 + (OO)-O-16-O-16 and O-18 + (OO)-O-16-O-16/O-18 + (OO)-O-18-O-18 remain the same in all bath gases, the first ratio being over 50% higher than the second. This suggests that the ozone isotope effect maybe discussed within the framework of the Lindemann-Hinshelwood mechanism but with isotope specific steps: The selectivity arises in the first collision between O + O-2 which produces the activated complex O-3* and does not come from the subsequent collisional deactivation ana stabilisation through the third body. (C) 2000 Elsevier Science B.V. All rights reserved.

引用

页码：31 / 36

页数：6

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