Kinetic studies of the reactions of O(1D) with several atmospheric molecules

The rate coefficients for the removal of O(1D) by N2, O2, N2O, CO2, O3 and n-butane were measured between 210 and 370 K. The appearance of O(3P) was observed following photolytic production of O(1D) in an excess of the reactants. The measured rate coefficients in this study, in units of 10−10 cm3 molecule−1 s−1, are: k1(N2) = (0.195 ± 0.020)exp((125 ± 20)/T); k2(O2) = (0.365 ± 0.023)exp((22 ± 10)/T); k3(N2O) = (1.17 ± 0.20)exp((40 ± 50)/T); k4(CO2) = (0.79 ± 0.07)exp((110 ± 20)/T); k5(O3) = (2.65 ± 0.35)exp((−20 ± 40)/T); k6(n-C4H10) = (5.00 ± 1.55)exp((−10 ± 90)/T). The quoted uncertainties include estimated systematic errors and are at the 95% confidence level. Our results are compared with previous measurements, particularly the very recent data from Strekowski et al. (this issue) and Blitz et al., (this issue), to produce a set of rate coefficients most appropriate for use in atmospheric calculations. The newly recommended rate coefficients, in units of 10−10 cm3 molecule−1 s−1, are: k1(N2) = (0.21 ± 0.02)exp((115 ± 10)/T); k2(O2) = (0.312 ± 0.025)exp((70 ± 10)/T); k3(N2O) = (1.11 ± 0.11)exp((17 ± 40)/T); k4(CO2) = (0.74 ± 0.07)exp((133 ± 40)/T); k5(O3) = (2.37 ± 0.36)exp((6 ± 15)/T); k6(n-C4H10) = (5.35 ± 0.54)exp((−33 ± 32)/T).