Gas-phase rate constants for the reaction of NO3 radicals with a series of cyclic alkenes, 2-ethyl-1-butene and 2,3-dimethyl-1,3-butadiene

摘要

The gas-phase reaction of NO3 radicals with selected cyclic alkenes has been studied in a flow system at 298 +/- 2 K at a total pressure of 6.8 mbar using helium as carrier gas. Rate constants obtained with the relative rate method were: cyclopentene, (3.78 +/- 0.47) x 10(-13); cyclohexene, (4.91 +/- 0.47) X 10(-13); cycloheptene, (5.42 +/- 0.23) X 10(-13) 1-methylcyclohexene, (1.03 +/- 0.08) X 10(-11); 1,2-dimethylcyclohexene, (5.15 +/- 0.34) X 10(-11); 2,3-dimethylcyclohexene, (1.54 +/- 0.23) X 10(-11); methylenecyclopropane, (1.38 +/- 0.23) X 10(-14); methylenecyclobutane, (4.21 +/- 0.39) X 10(-13); methylenecyclopentane, (1.52 +/- 0.13) X 10(-12); methylenecyclohexane, (5.38 +/- 0.70) X 10(-13); methylenecycloheptane, (1.01 +/- 0.13) X 10(-12); 3-methylenecyclohexene, (5.72 +/- 0.37)X 10(-12); alpha-pinene, (5.82 +/- 0.56)X 10(-12); and beta-pinene, (2.81 +/- 0.56) X 10(-11) cm(3) molecule(-1) s(-1). The corresponding rate constants for 2-ethyl-1-butene, (4.52 +/- 0.39) X 10(-13) and 2,3-dimethyl-1,3-butadiene, (1.37 +/- 0.15) X 10(-12) cm(3) molecule(-1) s(-1), were determined. The errors (2 sigma) contain only the uncertainties from the obtained rate constant ratios. (C) 1998 Elsevier Science B.V. All rights reserved. [References: 28]