J. Sytsma et al., SPECTROSCOPIC STUDIES AND CRYSTAL-FIELD ANALYSIS OF CM3+ AND GD3(+) IN LUPO4, Physical review. B, Condensed matter, 52(17), 1995, pp. 12668-12676
Optical-absorption and laser-selective-excitation spectroscopy have be
en used to investigate the electronic energy level structures of the a
ctinide ion Cm3+ and the lanthanide ion Gd3+ in host crystals of LuPO4
. Crystal-field levels have been determined up to 35 000 and 37 000 cm
(-1), respectively, for the principal D-2d symmetry substitutional sit
e. These have been analyzed in terms of a parametric Hamiltonian and t
he two systems compared. High-resolution fluorescence spectroscopy was
used to resolve the ground-term splittings of Cm3+ and these are comp
ared to the zero-field splittings measured in a previous EPR investiga
tion. Some weaker fluorescence features also were observed, which are
attributed to minor Cm3+ sites in the host lattice. Two-photon excitat
ion was observed to the P-6(5/2) and P-6(7/2) multiplets of Gd3+.