| C6 | C8 | C10 | Ref. |
|---|---|---|---|
| 3.796[3] | 3.892[5] | 4.789[7] | S. H. Patil and K. T. Tang, J. Chem. Phys. 106, 2301 (1997) |
| 3.813[3] | 4.096[5] | 5.248[7] | M. Marinescu, H. R. Sadeghpour, and A. Dalgarno, Phys. Rev. A 49, 982 (1994) |
| 3.637[3] | 4.011[5] | 5.431[7] | D. Spelsberg, T. Lorenz, and W. Meyer, J. Chem. Phys. 99, 7845 (1993) |
| 4.721[3] | 3.894[5] | 4.069[7] | B. Bussery and M. Aubert-Frecon, J. Chem. Phys. 82, 3224 (1985) |
| 4.00(0.03)[3] | 3.92(0.08)[5] | 4.58(0.18)[7] | J. M. Standard and P. R. Certain, J. Chem. Phys. 83, 3002 (1985) |
| 3.780[3] | - | - | M. L. Manakov and V. O. Ovsiannikov, J. Phys. B 10, 569 (1985) |
| 3.574[3] | - | - | W. Muller, J. Flesch, and W. Meyer, J. Chem. Phys. 80, 3297 (1984) |
| 3.945[3] | 3.834[5] | 4.522[7] | F. Maeder and W. Kutzelnigg, Chem. Phys. 42, 195 (1979) |
| 3.89(0.02)[3] | 4.465(0.269)[5] | 5.489(0.531)[7] | K. T. Tang, J. M. Norbeck, and P. R. Certain, J. Chem. Phys. 64, 3063 (1975) |
| 3.93(0.05)[3] | - | - | P. W. Langhoff and M. Karplus, J. Chem. Phys. 53, 233 (1970) |
| 3.680[3] | - | - | A. Dalgarno and W. D. Davision, Adv. At. Mol. Phys. 2, 1 (1966) |