| C6 | C8 | C10 | Ref. |
|---|---|---|---|
| 1.561[3] | n/a | n/a | P. Hkrachenko, J. F. Babb, and A. Dalgarno, Phys. Rev. A, 55, 3566 (1997) |
| 1.500[3] | 1.090[5] | 1.068[7] | S. H. Patil and K. T. Tang, J. Chem. Phys. 106, 2301 (1997) |
| 1.472[3] | 1.119[5] | 1.107[7] | M. Marinescu, H. R. Sadeghpour, and A. Dalgarno, Phys. Rev. A 49, 982 (1994) |
| 1.527[3] | 1.141[5] | 1.113[7] | D. Spelsberg, T. Lorenz, and W. Meyer, J. Chem. Phys. 99, 7845 (1993) |
| 1.698[3] | 1.028[5] | 6.939[6] | B. Bussery and M. Aubert-Frecon, J. Chem. Phys. 82, 3224 (1985) |
| 3.235(1.765)[3] | 1.53(0.48)[5] | 1.324(0.356)[7] | J. M. Standard and P. R. Certain, J. Chem. Phys. 83, 3002 (1985) |
| 1.330[3] | n/a | n/a | M. L. Manakov and V. O. Ovsiannikov, J. Phys. B 10, 569 (1985) |
| 1.518[3] | n/a | n/a | W. Muller, J. Flesch, and W. Meyer, J. Chem. Phys. 80, 3297 (1984) |
| 1.51[3] | 1.115(0.445)[5] | 1.072(0.069)[7] | K. T. Tang, J. M. Norbeck, and P. R. Certain, J. Chem. Phys. 64, 3063 (1975) |
| 1.70(0.01)[3] | n/a | n/a | P. W. Langhoff and M. Karplus, J. Chem. Phys. 53, 233 (1970) |
| 1.540[3] | 1.098[5] | 1.036[7] | F. Maeder and W. Kutzelnigg, Chem. Phys. 42, 195 (1979) |
| 1.470[3] | n/a | n/a | A. Dalgarno and W. D. Davision, Adv. At. Mol. Phys. 2, 1 (1966) |