| C5 | C6 | C8 | Ref. |
|---|---|---|---|
| 6.9855[2] | 5.195[3] | -4.3598[5] | M. Marinescu, Phys. Rev. A 56, 4764 (1997) |
| 7.39[2] | 4.76[3] | n/a | M. Rerat, B. Bussery, and M. Frecon, J. Mol. Spectrosc. 182, 260 (1997) |
| 7.50[2] | 5.3[3] | n/a | M. Rerat, B. Bussery, and M. Frecon, J. Mol. Spectrosc. 182, 260 (1997) |
| 6.98[2] | 4.891[3] | n/a | B. Bussery and M. Frecon, J. Mol. Spectrosc. 115, 169 (1989) |
| 7.25(0.5)[2] | 2.75(0.2)[3] | n/a | D. D. Konowalow and J. Fish, Chem. Phys. 77, 435 (1983) |