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Kinetics of the reactions of OH with alkanes

✍ Scribed by R. K. Talukdar; A. Mellouki; T. Gierczak; S. Barone; S-Y. Chiang; A. R. Ravishankara

Publisher: John Wiley and Sons
Year: 1994
Tongue: English
Weight: 906 KB
Volume: 26
Category: Article
ISSN: 0538-8066
DOI: 10.1002/kin.550261003

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✦ Synopsis

The rate coefficients for the reactions of OH with ethane ( k l ) , propane (kz), n-butane (k3), iso-butane (k4), and n-pentane ( k 5 ) have been measured over the temperature range 212-380 Kusing the pulsed photolysislaser induced fluorescence (PP-LIF) technique. The 298 Kvalues are (2.43 2 0.20) X (1.11 rf-0.08) X (2.06 rf-0.14) x 10-l2, and (4.10 rf-0.26) X cm3 molecule-l s-l for k l , kz, k3, k4, and k5, respectively. The temperature dependence of kl and kz can be expressed in the Arrhenius form: k l = (1.03 ? 0.07) X exp[-(660 rf-50)/T]. The Arrhenius plots for k3 -k5 were clearly curved and they were fit to three parameter expressions: k3 = (2.04 2 0.05) X T 2 exp[(85 +-10)/T]; k4 = (9.32 rf-0.26) X T 2 exp[(275 ? 20)/T]; and k5 = (3.13 2 0.25) x T 2 exp[(115 +-30)/T]. The units of all rate constants are cm3 molecule-l s-l and the quoted uncertainties are at the 95% confidence level and include estimated systematic errors. The present measurements are in excellent agreement with previous studies and the best values for atmospheric calculations are recommended. 0 1994 John Wiley & Sons, Inc.

(2.46 ? 0.15) X exp[-(1110 rf-40)/T] and kz = (1.01 rf-0.08) X

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