期刊
CHEMICAL PHYSICS LETTERS
卷 531, 期 -, 页码 64-69出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.cplett.2012.02.049
关键词
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资金
- European Community [237890]
- NRF of Korea [R31-2008-000-10055-0]
- Ministry of the Environment, Japan [A-0904]
- Ministry of Education, Culture, Sports, and Technology (MEXT), Japan [23224013]
- MEXT, Japan
- [22-7563]
- Grants-in-Aid for Scientific Research [10J07563] Funding Source: KAKEN
The S-34 and C-13 isotopic fractionations in the OCS + OH reaction are investigated using RRKM-theory. The reaction proceeds via different channels, at low pressures a channel leading to CO + SOH dominates. While with increasing pressure an adduct forming channel becomes competitive. The resulting overall rate constant is not strongly dependent on pressure and agrees well with experiments. The competition between channels makes the fractionation constants highly pressure dependent, however the sulfur-34 fractionation constant varies only from about -5 parts per thousand to 0 parts per thousand in the troposphere and lower stratosphere. The carbon-13 isotopic fractionation is stronger; between -40 parts per thousand and -70 parts per thousand in the troposphere and lower stratosphere. (C) 2012 Elsevier B.V. All rights reserved.
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