| C3 | C6 | C8 | Ref. |
|---|---|---|---|
| 16.872(0.028) | 9.365(0.141)[3] | n/a | H. Wang, P. L. Gould, and W. C. Stwalley, J. Chem. Phys. 106, 7899 (1997) |
| 17.33 | 9.393[3] | 1.975[6] | M. Marinescu and A. Dalgarno, Phys. Rev. A 52, 311 (1995) |
| 18.68 | 1.013[4] | 2.454[6] | B. Bussery and M. Aubert-Frecon, J. Chem. Phys. 82, 3224 (1985) |
| 17.54 | 9.651[3] | 1.892[6] | F. Vigne-Maeder, Chem. Phys. 85, 139 (1984) |