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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Abstract
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.