Dissociation dynamics of D2O+ ions prepared in the B 2B2 state

Abstract

The dissociative photoionization of the B ²B₂ state of D₂O⁺ has been investigated by an He I photoelectron–photoion coincidence technique. Both D⁺ and OD⁺ fragments are observed, and branching ratios and translational energy releases have been determined. Neither fragmentation channel shows evidence of any dependence upon the vibronic features observed in the photoelectron spectrum, suggesting complex dynamics. A high degree of product rotational excitation can be inferred from the kinetic energy data. These results are discussed in the light of dynamical studies of the B–à conical intersection and a possible subsequent ÖX internal conversion.