Introduction
Reactions of electronically excited oxygen atoms O(1D) is a main chemical removal of the mixed halogenated methane derivatives CFnX4−n (X = Cl, Br, I) in the stratosphere.
The kinetics for the production of O(3P), ClO and Cl radicals following the O(1D) reaction with the chloro-fluorometane CFnCl4−n (CFC-1n) have been well determined, because it is important to estimate the production rate of ClOx destroying the ozone layer.
The dominant reaction pathways of these reactions are the productions of O(3P) and ClO, while the reaction channel of Cl production is quite small contribution.1
Carpenter et al. observed the NCO and CN radicals in the reaction of O(1D) + HCN.2 They also reported that the production process of NCO have a slow rise time and concluded that the NCO radicals were not primary products of O(1D) + HCN.
The reason of these phenomenon has not been understood yet.
To examine whether similar phenomena are observed in the reaction of other species, we investigated the reaction process of O(1D) with CF3CN which was used as the pseudo-CF3Cl molecule.
We also determined the reaction rate constants for the production of O(3P) and the removal of O(1D) following the reaction CF3CN + O(1D).
1K. Takahashi et al., J. Phys. Chem. 100, 10145 (1996).
2B.K. Carpenter et al., J. Chem. Phys. 81, 1785 (1984).
CF3 + ClO are preferentially produced in the reaction
CF3Cl + O(1D).
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OH + CN are preferentially produced in the reaction
HCN + O(1D).
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Which products are preferential in the reaction
CF3CN + O(1D)?
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H,
C,
N,
O(1D),
O,
F,
Cl
.GIF){kind=small}
