Abstract
Abstract A semiempirical calculation of the energy level diagram of GdO based on the ligand field theory is presented here. The main frame of the resulting scheme is very simple and should be useful in order to link together the numerous observed systems of GdO. Pulsed dye laser-induced fluorescence experiments made possible the evaluation of some of the ligand field theory predictions, particularly that a Y7Σ− level is lying 1840 cm−1 above the X9Σ− ground state. The I and II systems are shown to arise from the B9Σ−-X9Σ− and B17Σ−-Y7Σ− transitions, respectively. Continous wave laser-excitation spectra have been recorded and rotational analysis of the A9Π4 → X9Σ− transition carried out, confirming previous results of N. N. Dmitriev, L. A. Kaledin, E. A. Shenyavkaya, and L. V. Gurvich (Acta Phys. Hung. 55, 467–479 (1984)).
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