Abstract
A detailed experimental study in the near infrared has been made of the low-lying excited states of Dy3+ in the ethyl sulphate lattice. The results, which were obtained using different forms of polarised light and the technique of magnetic circular dichroism, show significant differences from the earlier work on this system. Theoretical calculations of energy levels and g-values that include the effects of intermediate coupling and J-mixing have been made. A very satisfactory agreement between theory and experiment is found for the lower 6H11/2 manifold when using published crystal-field parameters derived to fit the experimental data on the ground state. Making some changes in these parameters yields an even closer fit.
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