Abstract
Abstract Collisions of Ar(3P2.0) and Kr(3P2.0) with Cl2 and Br2 were studied over the collision energy range 0.01–0.5 eV, using a crossed-beam time-of-flight technique. The dependence of the total chemiluminescence cross sections (from excimer formation plus excitation transfer) on collision energy follows the behavior expected from the orbiting-controlled curve-crossing model. The energy dependence for excitation transfer does not follow this model, and is quite different for Cl2 versus Br2. These results are explained by a phase-matching curve-crossing model, in terms of the A−/X2− trajectory motion and the phase of the X2− vibrational motion.
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