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|---|---|---|---|
| 2.3476[3] | 2.1653[5] | 2.4649[7] | M. Marinescu, Phys. Rev. A submitted |
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| 2.443[3] | n/a | n/a | F. Maeder and W. D. Kutzelnigg, Chem. Phys. 42, 95 (1979) |
| 2.41(0.01)[3] | 2.291(0.127)[5] | 2.468(2.0)[7] | K. T. Tang, J. M. Norbeck, and P. R. Certain, J. Chem. Phys. 64, 3063 (1976) |
| 2.57(0.02)[3] | n/a | n/a | P. W. Langhoff and M. Karplus, J. Chem. Phys. 53, 233 (1970) |
| 2.390[3] | n/a | n/a | A. Dalgarno and W. D. Davison, Mol. Phys. 13, 479 (1967) |