Abstract
Abstract The thermal gas-phase decomposition of vinyl bromide in Ar has been studied behind reflected shock waves over the temperature range between 1300 and 2000 K and the density range of 5.2×10−6–3.8×10−5 mol cm−3 by monitoring the UV absorption of C2H3Br and the IR emission of HBr. The decomposition proceeds via the molecular elimination of HBr, and the unimolecular process is in the low-pressure region under the present experimental conditions. The low-pressure-limit rate constant was obtained as k 2nd=1013.98±0.21exp{−(41.5±1.6 kcal mol−1)⁄RT} cm3 mol−1 s−1. The collision efficiency factor, βc, was obtained as about 2×10−4, considerably lower than that of vinyl chloride.
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