Abstract
The decay of CN radicals has been measured as a function of cyanoacetylene concentration by laser-induced fluorescence. The room-temperature rate constant obtained is (1.70 ± 0.08 ) × 10 −11 cm 3 molecule −1 s −1. This is about ten times slower than those of CN with unsaturated hydrocarbons, suggesting that there may be a small activation energy of about 1.5 kcal mol −1. On this basis, the rate constant at 150 K (an average temperature in Titan's stratosphere) would be 1.4 × 10 −12 cm 3 molecule −1 s −1. The reaction is interpreted as CN addition to an unsaturated bond, followed by H atom elimination. The product of this reaction may be C 4N 2 (which is formed in Titan's stratosphere).
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