Electronic Spectrum of Single-Crystal Dy2O3

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The absorption spectra of single crystals of Dy2O3 observed at 10°, 80°, and 290°K were analyzed in the 0.26–40-μ wavelength region. Over 600 transitions from all eight crystalline Stark levels of the ground 6H15/2 state to 40 excited J manifolds of the Dy3+ ion in C2 sites were assigned. The observed spectrum is assigned with the aid of a calculation of ``free-ion'' energy levels of Dy3+ between the ground state and 36 000 cm−1. The Racah parameters E1=6300, E2=31.95, E3=614.2, and ζ=−1881 cm−1, all obtained by direct diagonalization and least-squares fitting, yield an rms deviation of 83 cm−1 between 31 observed and calculated free-ion energy levels. The 6F1/2 state, and all states above 23 000 cm−1 are reported and analyzed for the first time in any crystal.