Dissociative charge exchange of and with cesium: Dissociation dynamics and two- and three-body branching fractions

The two-and three-body center-of-mass kinetic energy release distributions for H3 and D3 along with their branching fractions were measured using charge exchange of H 3 + and D 3 + with Cs. Vibrational and rotational excitation in the diatomic product and radiative decay to the repulsive ground state from a manifold of Rydberg states are observed in both systems. The two-body dissociation pathway is found to be dominant, however, for higher-lying Rydberg states, the three-body pathway becomes increasingly important.