Laser Spectroscopy of Cerium Monofluoride: Ligand Field Assignments of Some 4 f 5 d 6 p >- 4 f 5 d 6 s Transitions

Author： Bloch J.C. McCarthy M.C. Field R.W. Kaledin L.A.

ISSN： 0022-2852

Source： Journal of Molecular Spectroscopy, Vol.177, Iss.2, 1996-06, pp. : 251-262

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Abstract

The techniques of selectively detected fluorescence excitation, dispersed fluorescence, and magnetic rotation spectroscopy have been applied to the CeF molecule and used to characterize one [17.6]4.5 electronic state in the =~2 eV region and three electronic states with T 0 < 2000 cm -1 : X (1)3.5 and (2)3.5 with Omega = 3.5 and (1)4.5 with Omega = 4.5. Two of these states, the [17.6]4.5 and X (1)3.5 states, had been observed previously [R. M. Clements and R. F. Barrow, J. Mol. Spectrosc. 107, 119 (1984); Y. Azuma, W. J. Childs, and K. L. Menningen, J. Mol. Spectrosc. 145, 413 (1991)]. Based on the pattern of Omega-values and the value of Delta G 1/2 ~ 550 cm -1 , the three low-lying states are assigned to the Ce + (4 f 5 d ( 3 H)6 s )F - superconfiguration. The upper state is assigned to the Ce + (4 f 5 d ( 3 H)6 p )F - superconfiguration on the basis of computed ligand field monopole B 0 0 ( nl , nl ) orbital destabilization energies and one-electron transition propensity rules.