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Kinetics of OH radical reactions with a series of ethers

1995; Wiley; Volume: 27; Issue: 8 Linguagem: Inglês

10.1002/kin.550270806

1097-4601

Abdelwahid Mellouki, S. Téton, G. Le Bras,

Air Quality and Health Impacts

Abstract The rate constants for the reactions of OH with dimethyl ether ( k 1 ), diethyl ether ( k 2 ), di‐ n ‐propyl ether ( k 3 ), di‐isopropyl ether ( k 4 ), and di‐ n ‐butyl ether ( k 5 ) have been measured over the temperature range 230–372 K using the pulsed laser photolysis‐laser induced fluorescence (PLP‐LIF) technique. The temperature dependence of k 1 , k 4 , can be expressed in the Arrhenius plots form: k 1 = (6.30 ± 0.10) × 10 −12 exp[−(234 ± 34)/ T ] and k 4 = (4.13 ± 0.10) × 10 −12 exp[(274 ± 26)/ T ]. The Arrhenius plots for k 2 , k 3 , and k 5 , were curved and they were fitted to the three parameter expressions: k 2 = (1.02 ± 0.08) × 10 −17 T 2 exp[(797 ± 24)/ T ], k 3 = (1.84 ± 0.23) × 10 −17 T 2 exp[(767 ± 34)/ T ], and k 5 = (6.29 ± 0.74) × 10 −18 T 2 exp[(1164 ± 34)/ T ]. The values at 298 K are (2.82 ± 0.21) × 10 −12 , (1.36 ± 0.11) × 10 −11 ,(2.17 ± 0.16) × 10 −11 , (1.02 ± 0.10) × 10 −11 , and (2.69 ± 0.22) × 10 −11 for k 1 , k 2 , k 3 , k 4 , and k 5 , respectively, (in cm 3 molecule −1 s −1 ). These results are compared to the literature data. © 1995 John Wiley & Sons, Inc.