Reactive scattering of a supersonic chlorine atom beam: Cl + C 2 H 5 I

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Abstract
Reactive scattering of Cl atoms with C2H5I molecules has been studied over the range of initial translational energy E = 63 - 24 kJ mol-1, using a supersonic beam of Cl atoms seeded in He and Ne buffer gas. Laboratory angular and velocity distributions of ICl product were measured which show that reaction proceeds via a long-lived collision complex at low initial translational energy. However at intermediate and higher initial translational energy, a forward scattered component emerges with a higher product translational energy than that of the long-lived complex component. This breakdown of long-lived complex dynamics occurs more readily in collisions at large impact parameters in contrast to the osculating complex model which assumes a statistical distribution of lifetimes independent of impact parameter.