The optical absorption spectra and luminescence spectra of TbAl (BO ) have been recorded. The crystal-field transitions were 3 3 4 8 3 1 assigned assuming D symmetry. The energy level diagram of the 4f electronic configuration of Tb was parametrized in terms of 21 3 k free-ion and 6 B crystal-field parameters. A total number of 74 experimental crystal-field levels was used in the fitting procedure. The q 31 31 crystal-field parameters of Tb in TbAl (BO ) are compared with those of Eu in GdAl (BO ) .
The spectroscopic properties of the tetravalent uranium ion (U) have been investigated in fluoride, fluorophosphate and phosphate 2 glasses. Absorption and magnetic circular dichroism (MCD) spectra were recorded. The energy levels of the 5f electronic configuration 41 2 of U are simulated by a set of free-ion parameters and expressions for the 5f wavefunctions are presented. The spectroscopic 41 41 behaviour of U in glasses is compared with the spectroscopic behaviour of U in other matrices. Special attention is paid to the 2 2 similarities between the 5f electronic configuration of tetravalent uranium and the 4f configuration of trivalent praseodymium.
The optical absorption spectra of neodymium(III) butanoate, pentanoate, hexanoate, heptanoate and octanoate in 1-pentanol have been measured. This solvent has been chosen, because the neodymium(III) soaps are sufficiently soluble in it. A set of free-ion parameters is obtained by fitting the calculated energy levels against the experimental levels. The experimental dipole strengths of the transitions are determined from the absorption spectra and parameterised in terms of the Judd-Ofelt intensity parameters V (l52, 4, 6). The V values l 4 go through a maximum for neodymium(III) hexanoate, whereas the V parameter increases in the order butanoate,pentanoate, 2 hexanoate,heptanoate,octanoate. The V parameter shows only an increase between the butanoate and the pentanoate complex, whereas 6 this parameter remains fairly constant for the higher homologues of the neodymium(III) soaps.
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