Gas-phase rate constants for the reaction of NO3 radicals with selected oxiranes

The gas-phase reaction of NO3 radicals with selected oxiranes has been studied in a flow system at T = 295 ± 2 K in the pressure range 3.4–50 mbar musing N2 as carrier gas. The analysis of the organics was performed by means of on-line connected GC-FID. Rate constantswere obtained with the relative rate method: 3,4-epoxy-cyclohexene: (2.70 ± 0.18) × 10−3; 2,2-dimethyl-vinyl)-oxirane; (4.74 ± 0.54) × 10−12; 2-methyl-2-1(1-methyl-vinyl)-oxirane : (1.55 ± 0.12) × 10−13; 2-methyl-2-vinyloxirane; (9.40 ± 2.62) × 10−15; tetramethyloxirane: <5 × 10−15; and cis-2,3-dimethyloxirane: <5 × 10−15 cm−3 molecule−1 s−1.