Abstract
Optical-absorption and laser-selective-excitation spectroscopy have been used to investigate the electronic energy level structures of the actinide ion Cm{sup 3+} and the lanthanide ion Gd{sup 3+} in host crystals of LuPO{sub 4}. Crystal-field levels have been determined up to 35 000 and 37 000 cm{sup {minus}1}, respectively, for the principal {ital D}{sub 2{ital d}} symmetry substitutional site. These have been analyzed in terms of a parametric Hamiltonian and the two systems compared. High-resolution fluorescence spectroscopy was used to resolve the ground-term splittings of Cm{sup 3+} and these are compared to the zero-field splittings measured in a previous EPR investigation. Some weaker fluorescence features also were observed, which are attributed to minor Cm{sup 3+} sites in the host lattice. Two-photon excitation was observed to the {sup 6}{ital P}{sub 5/2} and {sup 6}{ital P}{sub 7/2} multiplets of Gd{sup 3+}.
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