TEMPERATURE-DEPENDENCE OF THE RATE CONSTANTS OF THE REACTIONS OF OXYGEN-ATOMS WITH TRANS-2-BUTENE, CIS-2-BUTENE, 2-METHYLPROPENE, 2-METHYL-2-BUTENE, AND 2,3-DIMETHYL-2-BUTENE

The kinetics of the reactions of ground state oxygen atoms with trans- 2-butene, cis-2-butene, 2-methylpropene, 2-methyl-2-butene, and 2,3-di methyl-2-butene was investigated in the temperature range 200 to 370 K . In this range, the rate constants are (in units 10(-11) cm3 s-1): (1 .1 +/- 0.1) exp[+(180 +/- 24)K/T]; (0.98 +/- 0.09) exp[+(149 +/- 23)K/ T]; (1.14 +/- 0.13) exp[+ (128 +/- 33)K/T]; (2.34 +/- 0.16) exp[+(250 +/- 16)K/T]; and (3.31 +/- 0.50) exp[+(257 +/- 36)K/T], respectively. The atoms were generated by the H2 laser photolysis of NO and detected by the time resolved chemiluminescence in the presence of NO. The con centrations of the O(P-3) atoms were kept so low that secondary reacti ons with products are unimportant. (C) 1995 John Wiley & Sons, Inc.