Abstract
Abstract The energy levels of the Rydberg states of H5 and their stability with respect to dissociation into H3 + H2 have been studied with quantum-chemical methods. We predict that the lowest four electronic states of H5 are dissociative, but that many Rydberg states are metastable. The lowest one of them (1 2B2 in D2d symmetry) has a dissociation energy of = 76.6 kJ/mol, the higher ones are less strongly bound, some of them being distorted to C2, symmetry by a Jahn-Teller distortion. We have also estimated emission frequencies and transition moments of the transitions from the higher Rydberg states into the 1 2B2 state.
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