Rate coefficients and ClO radical yields in the reaction of O(1D) with CClF2CCl2F, CCl3CF3, CClF2CClF2, and CCl2FCF3

Rate coefficients, k, and ClO radical product yields, Y, for the gas-phase reaction of O(1D) with CClF2CCl2F (CFC-113) (k2), CCl3CF3 (CFC-113a) (k3), CClF2CClF2 (CFC-114) (k4), and CCl2FCF3 (CFC-114a) (k5) at 296 K are reported. Rate coefficients for the loss of O(1D) were measured using a competitive reaction technique, with n-butane (n-C4H10) as the reference reactant, employing pulsed laser photolysis production of O(1D) combined with laser-induced fluorescence detection of the OH radical temporal profile. Rate coefficients were measured to be k2 = (2.33 ± 0.40) × 10−10 cm3 molecule−1 s−1, k3 = (2.61 ± 0.40) × 10−10 cm3 molecule−1 s−1, k4 = (1.42 ± 0.25) × 10−10 cm3 molecule−1 s−1, and k5 = (1.62 ± 0.30) × 10−10 cm3 molecule−1 s−1. ClO radical product yields for reactions (2)–(5) were measured using pulsed laser photolysis combined with cavity ring-down spectroscopy to be 0.80 ± 0.10, 0.79 ± 0.10, 0.85 ± 0.12, and 0.79 ± 0.10, respectively. The quoted errors in k and Y are at the 2σ (95% confidence) level and include estimated systematic errors. © 2011 Wiley Periodicals, Inc.* Int J Chem Kinet 43: 393–401, 2011