Excited Electronic States of
- 1 January 1973
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review A
- Vol. 7 (1), 69-77
- https://doi.org/10.1103/physreva.7.69
Abstract
Excited electronic states of the molecule have been calculated with configuration-interaction (CI) variational trial functions that assure formally correct asymptotic behavior as well as the single-configuration self-consistent-field (SCF) approximation. CI results were obtained by both multiconfiguration self-consistent-field (MC-SCF) and pseudonatural orbital (PNO) techniques. The MC-SCF results are most accurate and are used to analyze the energy curves and wave functions of these states for internuclear separations larger than 3 a. u. All the excited states are found to have equilibrium-internuclear separations at least 1 a. u. larger than the ground state. The two lowest energy states, the and , are characterized, respectively, as shape and valence Feshbach resonances. They are sufficiently bound to make it likely they play a role in low-energy-electron scattering by oxygen.
Keywords
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