Abstract
A simple technique for determining spin-correlated crystal field parameters from spectroscopic data, which depends on the superposition model, is developed. This avoids the need for detailed simultaneous fits to both free-ion and crystal field parameters and provides a practicable method for low-symmetry systems. New sets of parameters have been obtained for the systems Ho3+:YPO4, Er3+:YAlO3 and Nd3+:PbMoO4. Similar results to those from the detailed fitting procedure were obtained for HO3+:LaCl3. The results conform that the rank-six spin-correlated crystal field contributes significantly to lanthanide crystal field splittings.

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