Abstract

Nonadiabatic dynamics in the title reaction have been investigated by 2+1 REMPI detection of the Cl(P3∕22) and Cl*(P1∕22) products. Reaction was initiated by photodissociation of CH3I at 266nm within a single expansion of a dilute mixture of CH3I and HCl in argon, giving a mean collision energy of 7800cm−1 in the center-of-mass frame. Significant production of Cl* was observed, with careful checks made to ensure that no additional photochemical or inelastic scattering sources of Cl* perturbed the measurements. The fraction of the total yield of Cl(PJ2) atoms formed in the J=12 level at this collision energy was 0.150±0.024, and must arise from nonadiabatic dynamics because the ground potential energy surface correlates to CH4+Cl(P3∕22) products.

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