| C6 | C8 | C10 | Ref. |
|---|---|---|---|
| 3.110[4] | 4.514[6] | 1.250[9] | M. Marinescu and A. Dalgarno, Phys. Rev. A 52, 311 (1995) |
| 3.121[4] | 4.472[6] | n/a | B. Bussery and M. Aubert-Frecon, J. Mol. Spectrosc. 115, 169 (1986) |
| 3.188[4] | 4.455[6] | 1.232[9] | F. Vigne-Maeder, Chem. Phys. 85, 139 (1984) |
| 3.090[4] | n/a | n/a | T. Caves, J. Chem. Phys. 59, 6177 (1973) |