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The fragmentation dynamics of predissociative SO2(C1B2) is investigated on anaccurate adiabatic potential energy surface (PES) determined from high level abinitio data. This singlet PES features non-C2v equilibrium geometries for SO2,which are separated from the SO + O dissociation limit by a barrier resultingfrom a conical intersection with a repulsive singlet state. The ro-vibrationalstate distribution of the SO fragment is determined quantum mechanically formany predissociative states of several sulfur isotopomers of SO2. Significantrotational and vibrational excitations are found in the SO fragment. It isshown that these fragment internal state distributions are strongly dependenton the predissociative vibronic states, and the excitation typically increaseswith the photon energy.

Final State Resolved Quantum Predissociation Dynamics of SO2(C1B2) and Its Isotopomers via a Crossing with a Singlet Repulsive State