Crossed-Beam Investigation of O(P-3) + C2H5 -> C2H4 + OH
- Authors
- Park, Yong-Pal; Kang, Kyoo-Weon; Jung, Se-Hee; Choi, Jong-Ho
- Issue Date
- 15-4월-2010
- Publisher
- AMER CHEMICAL SOC
- Keywords
- Crossed-beam O(3P) C2H5
- Citation
- JOURNAL OF PHYSICAL CHEMISTRY A, v.114, no.14, pp.4891 - 4895
- Indexed
- SCIE
SCOPUS
- Journal Title
- JOURNAL OF PHYSICAL CHEMISTRY A
- Volume
- 114
- Number
- 14
- Start Page
- 4891
- End Page
- 4895
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/116630
- DOI
- 10.1021/jp910615y
- ISSN
- 1089-5639
- Abstract
- The reaction dynamics of ground-state atomic oxygen [O(P-3)] with an ethyl radical (C2H5) in the gas phase was investigated using high-resolution laser spectroscopy in a crossed-beam configuration. An exothermic channel of O(P-3) + C2H5 -> C2H4 + OH was identified, and the nascent distributions of OH (X (2)Pi: nu '' = 0, 1) showed significant internal excitations with an unusual bimodal feature of low and high rotational N ''-components with neither spin-orbit nor A-doublet propensities. On the basis of the ab initio and statistical calculations, the reaction mechanism can be rationalized by two competing mechanisms: abstraction vs addition. The low N ''-components with significant vibrational excitation can be described in terms of the direct abstraction process as a major channel. The extraordinarily hot rotational distribution of high N ''-components implies that a portion of the fraction proceeds through the indirect short-lived addition-complex forming process. From the comparative analysis of the reactions of O(P-3) + several hydrocarbon molecules and radicals, the reactivity and mechanistic characteristics of the title reaction are discussed.
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