| C6 | C8 | C10 | Ref. |
|---|---|---|---|
| 2.4683[3] | 2.2825[5] | 2.5645[7] | M. Marinescu, Phys. Rev. A submitted |
| 2.500[3] | 2.190[5] | 1.356[7] | S. H. Patil and K. T. Tang, J. Chem. Phys. 106, 2298 (1996) |
| 2.807[3] | 2.272[5] | n/a | B. Bussery, Y. Achker, and M. Aubert-Frecon, Chem. Phys. 116, 319 (1987) |
| 2.54(0.01)[3] | 2.18(0.05)[5] | 2.32(0.09)[7] | J. M. Standard and P. R. Certain, J. Chem. Phys. 83, 3002 (1985) |
| 2.59(0.01)[3] | 2.422(1.64)[5] | 2.537(2.145)[7] | K. T. Tang, J. M. Norbeck, and P. R. Certain, J. Chem. Phys. 64, 3063 (1976) |
| 2.52(0.01)[3] | n/a | n/a | P. W. Langhoff and M. Karplus, J. Chem. Phys. 53, 233 (1970) |
| 2.440[3] | n/a | n/a | A. Dalgarno and W. D. Davison, Mol. Phys. 13, 479 (1967) |