Optical spectra, energy levels, and crystal-field analysis of tripositive rare-earth ions in Y2O3. III. Intensities and g values for C2 sites

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We report measurements of the oscillator strengths between the Stark-split ground level and numerous excited Stark levels of Nd3+, Sm3+, Er3+, and Tm3+ in the C2 sites of Y2O3. Experimental results are compared with calculations based on the Judd–Ofelt theory of induced electric-dipole transitions, which uses the odd-parity terms in the crystal-field interaction (determined via an effective point-charge model). We also compare our theoretical results with previous measurements of manifold-to-manifold oscillator strengths, excited-state lifetimes, and Judd–Ofelt intensity parameters. Magnetic-dipole contributions to the intensities are included as well. Calculated ground-state g values for all the rare earths with an odd number of f electrons are reported. Comparison of theoretical and experimental results indicates that good agreement is obtained in most cases.