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Table 1.
Reference configurations used to build up the MCDF active space for O I–O VII.
| Ion | Reference configurations |
|---|---|
| O I | 2p4, [2s]2p5, [2s]22p6, [1s]2p5, [1s][2s]2p6 |
| O II | 2p3, [2s]2p4, [2s]22p5, [1s]2p4, [1s][2s]2p5, [1s][2s]22p6 |
| O III | 2p2, [2s]2p3, [2s]22p4, [1s]2p3, [1s][2s]2p4, [1s][2s]22p5 |
| O IV | 2p, [2s]2p2, [2s]22p3, [1s]2p2, [1s][2s]2p3, [1s][2s]22p4 |
| O V | 2s2, 2s2p, 2p2, [1s]2s22p, [1s]2s2p2, [1s]2p3 |
| O VI | 2s, 2p, [1s]2s2p, [1s]2p2 |
| O VII | 1s2, 1s2s, 1s2p |
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