| C5 | C6 | C8 | Ref. |
|---|---|---|---|
| -1.7463[2] | 1.4730[4] | -6.3043[5] | M. Marinescu, Phys. Rev. A 56, 4764 (1997) |
| -1.85[2] | 1.29[4] | n/a | M. Rerat, B. Bussery, and M. Frecon, J. Mol. Spectrosc. 182, 260 (1997) |
| -1.87[2] | 1.57[4] | n/a | M. Rerat, B. Bussery, and M. Frecon, J. Mol. Spectrosc. 182, 260 (1997) |
| 1.75[2] | 1.4356[4] | n/a | B. Bussery and M. Frecon, J. Mol. Spectrosc. 115, 169 (1989) |
| -1.28(0.1)[2] | 7.36(0.2)[3] | n/a | D. D. Konowalow and J. Fish, Chem. Phys. 77, 435 (1983) |