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Charge-exchange neutralization of H3+ with Cs allows preparation of the low-lying Rydberg states of H3. These states are predissociated by the repulsive ground state and may play roles as intermediates in the dissociative recombination of H3+ + e−. Translational spectroscopy and measurements of product momentum partitioning in three-body dissociative charge exchange of fast (12 keV) H3+ and D3+ with Cs yields insights into the nuclear motion during dissociation for the three lowest-lying 2s 2A1', 2p 2A2'' and 3p 2E' bound Rydberg states of H3 and the two 2s 2A1' and 2p 2A2'' states for D3. This data provide an empirical benchmark for the refinement of theoretical models involving non-adiabatic interactions and dynamics for H3.

Experimentally probing the three-body predissociation dynamics of the low-lying Rydberg states of H3and D3

Experimentally probing the three-body predissociation dynamics of the low-lying Rydberg states of H₃and D₃