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Abstract
Reactive scattering of O atoms with Br2 molecules has been studied at an initial translational energy E = 40 kJ mol-1 using a supersonic beam of O atoms seeded in He, and at E = 15 kJ mol-1 using O atoms seeded in Ne. Velocity distributions of OBr product were measured by cross-correlation time-of-flight analysis. Full contour maps of the differential reaction cross-section have been obtained. For O atoms seeded in Ne, there is peaking in the forward direction with a lower intensity 0·6 ± 0·1 in the backward direction. The product translational energy distribution agrees with that predicted by a long-lived collision complex model with a tight linear transition state for dissociation. For O atoms seeded in He, the scattering in the backward direction is increased to 1·2 ± 0·1 and has a higher product translational energy than the scattering in the forward direction. The reactive scattering observed at the lower initial translational energy indicates a short-lived O-Br-Br collision complex with a lifetime a...
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