Laser Spectroscopy of Dysprosium Monofluoride: Ligand Field Assignments of States Belonging to the 4f96s2, 4f106s, and 4f96s6pSuperconfigurations

✍ Scribed by Michael C. McCarthy; Jonathan C. Bloch; Robert W. Field; Leonid A. Kaledin

• Publisher: Elsevier Science
• Year: 1996
• Tongue: English
• Weight: 231 KB
• Volume: 179
• Category: Article
• ISSN: 0022-2852
• DOI: 10.1006/jmsp.1996.0204

✦ Synopsis

The techniques of selectively detected fluorescence excitation and dispersed fluorescence spectroscopy have been used to characterize two [19.3]8.5 and [20.3]8.5 electronic states of DyF in the region of Ç2.5 eV and five electronic states with T 0 õ 6500 cm 01 . Superconfigurational assignments of the observed low-lying states have been made on the basis of vibrational frequencies. The X (1)7.5 ground state, with DG 1/2 É 605 cm 01 , is assigned to the Dy / 4 f 9 6s 2 superconfiguration, whereas four states, (1)8.5, (2)7.5, (3)7.5, and (4)7.5, with DG 1/2 É 508-544 cm 01 are assigned to the Dy / 4 f 10 6s superconfiguration. The lowest 4 f 10 6s (V Å 8.5) state is found to lie 2431 cm 01 above the 4 f 9 6s 2 X (1)7.5 ground state, thus establishing the linkage between the 4 f 9 6s 2 and 4 f 10 6s superconfigurations. The upper states in the region of Ç2.5 eV ([19.3]8.5 and [20.3]8.5) are assigned to the Dy / 4 f 9 6s6p superconfiguration on the basis of computed ligand field monopole B 0 0 (nl, nl) orbital destabilization energies. The observed electronic states are discussed in relation to predictions of the ligand field theoretical model.