Displacement reaction dynamics of fluorine atoms with vinyl bromide molecules

Reactive scattering of F atoms with C 2 H 3 Br molecules leading to both H and Br atom displacement has been studied at an initial translational energy E∼40 kJ mol -1 using a supersonic beam of F atoms seeded in He buffer gas. The center-of-mass angular distribution of C 2 H 3 F reactive scattering shows a sharp forward peak with a lower backward peak of relative intensity ∼0.5. The product translational energy distribution peaks at a low fraction f' pk ∼0.1 of the total available energy with a tail extending up to higher energy. The branching ratio ∼10 strongly favors Br atom displacement over H atom displacement