Reactions of O(21 D 2) and O(23 P J ) with halogenomethanes
- 1 January 1979
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Faraday Discussions of the Chemical Society
- Vol. 67, 286-296
- https://doi.org/10.1039/dc9796700286
Abstract
Product branching ratios for the reaction of O(21D2) with the halogenomethanes CF3Cl, CF3Br, CF3I and CF2HCl are presented. The dominant channel is shown to be abstraction yielding a halogen oxide. This contrasts with the behaviour observed with hydrocarbons, where insertion into C–H bonds dominates. Quenching of O(21D2) to the ground state is also observed with the halogenomethanes and accounts for ≈ 30% of the total removal cross-section. Reaction of O(21D2) with CF2HCl leads to the formation of CIO (55%) and to the elimination of HCl (40%). The latter process is accompanied by the formation of CF2 and O(23PJ). The reactions of O(21D2) are compared with those for O(23PJ), where these are known, and the absolute rate for reaction of O(23PJ) with CF3I is determined as (1.1 ± 0.3)× 10–11 cm3 molecule–1 s–1 at 300 K. The results are discussed in terms of the main topological features on the potential surfaces involved.Keywords
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