Kinetics of the deactivation of I(52P1/2) by Br2. II. Production of electronically excited bromine atoms, Br(42P1/2), by chemical reaction

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Abstract
The production of bromine atoms in the ground, 42P3/2, and electronically excited, 42P1/2, states following the reactive deactivation of I(52P1/2) by Br2 was monitored by time‐resolved resonance absorption spectroscopy. Observation of the absorption transient, corresponding to attenuation of resonance emission by atoms in the reaction vessel, demonstrates that the predominant products of these reactive collisions is Br(42P1/2), approximately 80% of the atoms being formed in the electronically excited spin‐orbit state. The deactivation of I(52P1/2) by halogens is discussed in terms of a simple molecular orbital model which suggests that electronically adiabatic production of Br(42P1/2) proceeds following side‐on attack of the iodine atom on the Br2 molecule.