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

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...

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Bibliographic Details
Published in:The Journal of chemical physics 1990-02, Vol.92 (4), p.2219-2228
Main Authors: LEMBO, L. J, BJERRE, N, HUESTIS, D. L, HELM, H
Format: Article
Language:English
Subjects:
Atomic and molecular physics
Exact sciences and technology
Molecular properties and interactions with photons
Photon interactions with molecules
Physics
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Summary: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.
ISSN:0021-9606
1089-7690
DOI:10.1063/1.458014