Rate coefficients for the reactions of OH with n‐propanol and iso‐propanol between 237 and 376 K

The rate coefficients for the reaction OH + CH3CH2CH2OH products (k1) and OH + CH3CH(OH)CH3 products (k2) were measured by the pulsed-laser photolysis–laser-induced fluorescence technique between 237 and 376 K. Arrhenius expressions for k1 and k2 are as follows: k1 = (6.2 ± 0.8) × 10−12 exp[−(10 ± 30)/T] cm3 molecule−1 s−1, with k1(298 K) = (5.90 ± 0.56) × 10−12 cm3 molecule−1 s−1, and k2 = (3.2 ± 0.3) × 10−12 exp[(150 ± 20)/T] cm3 molecule−1 s−1, with k2(298) = (5.22 ± 0.46) × 10−12 cm3 molecule−1 s−1. The quoted uncertainties are at the 95% confidence level and include estimated systematic errors. The results are compared with those from previous measurements and rate coefficient expressions for atmospheric modeling are recommended. The absorption cross sections for n-propanol and iso-propanol at 184.9 nm were measured to be (8.89 ± 0.44) × 10−19 and (1.90 ± 0.10) × 10−18 cm2 molecule−1, respectively. The atmospheric implications of the degradation of n-propanol and iso-propanol are discussed. © 2009 Wiley Periodicals, Inc. Int J Chem Kinet 42: 10–24, 2010

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