Abstract
Reactive scattering of Cl atoms with C2H3Br molecules has been studied at an initial translational energy E = 60 kJ mol-1, using a supersonic beam of Cl atoms seeded in He buffer gas. Laboratory angular and velocity distributions of C2H3Cl product have been measured which show reaction proceeding via a short-lived collision complex, with a lifetime ∼ 2 ± 1 rotational periods. The forward and backward scattering has a higher product translational energy, peaking at E′pk ∼ 35 kJ mol-1 than the sideways scattering peaking at E′pk ∼ 20 kJ mol-1. An extended version of the Halpern Strutinski model is presented to give an interpretation of the data whereby forward and backward scattering arises mainly from Cl atom attack at the CH2 end of the C2H3Br molecule followed by migration, but sideways scattering may include a contribution from Cl atom attack at the CHBr end of the molecule.
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