Abstract
The one-particle models of crystal-field theory provide a qualitative interpretation for the observed ground state splitting of four Kramers doublets of the 8S7/2 of Bk4+ doped into CeF4. A set of nine nonzero (Bqk) parameters corresponding a C2v point symmetry provide a very good correlation between the experimental data and simulated energy level schemes within a rms deviation of 13.7 cm−1. The calculated and experimental energy values have the same order-of-magnitude for the ground state and excited components. The total ground state splitting of the S-state ions of f-elements such as Bk4+ in CeF4 is larger when compared with Cm3+:LaCl3 and Gd3+:La(C2H5SO4)3⋅9H2O ions. The so-called crystal-field strength parameter, Nv, increases as a function of the increasing maximum splitting of the ground state due to a decrease in the participation of the pure 8S7/2 in the final composition of the ground state eigenvector.
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