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• W1976172735 endingPage "5237" @default.
• W1976172735 startingPage "5230" @default.
• W1976172735 abstract "The rate constants for the OH + isoprene and OH + ethylene reactions have been measured in He with 10% O2 (P = 2−6 Torr) and over the temperature range 300−423 K using a discharge-flow system coupled with laser-induced fluorescence. The measured rate constants for the OH + ethylene reaction are in good agreement with previously reported values. The termolecular rate constant (k0) at the low-pressure limit for the OH + ethylene reaction was determined to be (2.62 ± 0.25) × 10-29 cm6 molecule-2 s-1 at 300 K where the uncertainty represents 2 standard errors. An Arrhenius expression of k0 = (4.9 ± 0.2) × 10-31 exp[(1210 ± 130)/T] cm6 molecule-2 s-1 was obtained from a weighted linear least-squares fit of the k0 data versus temperature. The observed negative activation energy (-Ea/R) is larger than the currently recommended value. Unlike the OH + ethylene reaction, the rate constant for the OH + isoprene reaction is independent of pressure between 2 and 6 Torr at 300 K. The measured rate constant of (1.10 ± 0.04) × 10-10 cm3 molecule-1 s-1 at 300 K and 2 Torr agrees well with those measured at higher pressures. However, the rate constant for the OH + isoprene reaction begins to show a pressure dependence at temperatures of 343 K and higher. At 343 K, the termolecular rate constant was observed to be (10.50 ± 1.57) × 10-27 cm6 molecule-2 s-1. An Arrhenius expression of k0 = (9.3 ± 5.4) × 10-29 exp[(1560 ± 230)/T] cm6 molecule-2 s-1 was obtained from a weighted linear least-squares fit of the k0 data versus temperature. The negative activation energy for the OH + isoprene reaction is similar to that observed for the OH + ethylene reaction." @default.
• W1976172735 created "2016-06-24" @default.
• W1976172735 creator A5038520639 @default.
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• W1976172735 date "2000-05-11" @default.
• W1976172735 modified "2023-10-03" @default.
• W1976172735 title "Kinetic Study of the OH + Isoprene and OH + Ethylene Reactions between 2 and 6 Torr and over the Temperature Range 300−423 K" @default.
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• W1976172735 doi "https://doi.org/10.1021/jp993613a" @default.
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