| C3 | C6 | C8 | Ref. |
|---|---|---|---|
| 9.202 | 8.047[3] | 4.203[5] | M. Marinescu and A. Dalgarno, Phys. Rev. A 52, 311 (1995) |
| 10.06 | 1.135[4] | -4.733[5] | B. Bussery and M. Aubert-Frecon, J. Chem. Phys. 82, 3224 (1985) |
| 9.400 | 8.407[3] | 3.512[5] | F. Vigne-Maeder, Chem. Phys. 85, 139 (1984) |