Showing papers by "Mary K. Gilles published in 2000"
TL;DR: In this paper, the rate coefficient, k1, for the reaction OH + CF3I → products was measured under pseudo-first-order conditions in hydroxyl radical, OH, and the quoted uncertainties were 2σ (95% confidence limits, σA = AσlnA).
Abstract: The rate coefficient, k1, for the reaction OH + CF3I → products was measured under pseudo-first-order conditions in hydroxyl radical, OH. OH temporal profiles were monitored by laser-induced fluorescence (LIF), and CF3I concentrations were determined by UV/Visible absorption. We determined k1 (T) to be (2.10 ± 0.80) × 10-11 exp[−(2000 ± 140)/T] cm3 molecule-1 s-1, over the temperature range 271 to 370 K. The quoted uncertainties are 2σ (95% confidence limits, σA = AσlnA). Previous measurements of k1(T) are compared with our values, and possible reasons for the discrepancies are discussed. The heat of formation of HOI is deduced to be less than −16 kcal mole-1, if the products of reaction 1 are mostly HOI and CF3. These measurements support the earlier conclusion that the reaction of OH with CF3I plays a negligibly small role in the atmospheric removal of CF3I.
17 citations
TL;DR: An upper limit for the rate coefficient for the reaction of O(1D) with H2 was measured to be 5.7×10−15 cm3 at 240 K as mentioned in this paper.
Abstract: An upper limit for the rate coefficient for the reaction of
was measured to be 5.7×10−15 cm3
molecule−1 s−1 at 240 K. OH radicals were produced ia pulsed photolysis of a mixture of O3 and H2, ia the reaction of O(1D) with H2, in the presence of an excess of N2O5 with SF6
as the bath gas. The temporal profiles of OH, which followed pseudo-first order kinetics, were monitored by laser induced fluorescence. Concentrations of N2O5 were determined by UV/visible absorption. Using this limit for k1, the potential role of N2O5
loss and conversion to HNO3 due to reaction (1) in the stratosphere is deduced to be negligible relative to known pathways.
1 citations