Spectroscopic study of the second 3Πg state of H2 : A bound triplet state perturbed by a doubly excited state

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Abstract
A double‐resonance technique is employed to measure the positions of energy levels of the second 3Πg state of H2. Vibrational levels of this state with v>3 lie above the ionization threshold of H+2, and are observed both to autoionize and dissociate. This state, 23Πg, arises from the homogeneous interaction between the singly excited 1sσg3dπg and 1sσg4dπg diabatic Rydberg states with the core‐excited 2pσu2pπu state. The energy‐level spacings are in good agreement with a simple model calculation for the interacting potentials. We also include a listing of autoionizing levels lying in the same energy range.