Pressure dependence of the absolute rate constant for the reaction Cl+C2H2 from 210–361 K

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Abstract
The pressure dependence of the absolute rate constant for the reaction Cl+C2H2 →M ClC2H2 has been examined at four temperatures ranging from 210–361 K using the flash photolysis‐resonance fluorescence (FP‐RF) techniques. The data has been fitted to the Troe expression to determine the values of the low pressure, three body rate coefficient k0, and the high pressure limiting bimolecular rate coefficient k∞ at each temperature. The temperature dependence of k0 is given by (3.15±0.30)×10−21 T−3.50±0.05 cm6 s−1 and for k∞ by (1.52±0.15)×10−4 T−2.63±0.05 cm3 s−1. The implication of these results for upper atmospheric chemistry is briefly discussed.