A detailed crystal-field splitting analysis is reported for the energy levels of Dy3+(4f9) in crystals of YAlO3 and DyAlO3 orthoaluminates. Experimental energy (Stark) levels for the 15 lowest-energy LJ2S+1 multiplet manifolds of Dy3+ are reported and supplemented with values found in the literature. A parameterized Hamiltonian, including Coulombic, spin-orbit, configuration interaction, and crystal-field terms in Cs symmetry, was diagonalized for the HJ6, FJ6, FJ4, IJ4, and GJ4 states. Initial sets of crystal-field parameters were determined from lattice-sum calculations and the three-parameter theory. Considerable J-mixing is found for states having nearly the same energy such as the manifolds F11/26, H9/26, and F9/26, H7/26. Even states that are well separated from each other in energy show sufficient J mixing to explain the polarized absorption and Zeeman effects that involve transitions from the nearly pure (less than 0.2% J mixing) ground state, H15/26 to excited states such as F5/26 and F3/26. The rms for 70 calculated-to-experimental Stark levels for Dy3+ in YAlO3 is 10 cm−1; the rms for 43 calculated-to-experimental levels for Dy3+ in DyAlO3 is 8 cm−1.
The Zeeman effect is investigated in the green luminescence band corresponding to the 4f→4f radiative transition 5 D 4 → 7 F 5 of Tb 3+ ions in Tb 0.2 Y 2.8 A l5 O 12 terbium-yttrium-aluminum garnet at the temperature Т = 85 K. It is demonstrated that an external field causes not only the Zeeman shifts of the resonant frequencies of radiative transitions in the luminescence spectra but also changes in the emission line intensities caused by modification of the optical transition probabilities in the σ -and σ + opposite circular polarization states. Special features of field dependences of the Zeeman effect for the emission lines are qualitatively explained based on the results of numerical energy spectrum calculations for the 5 D 4 and 7 F 5 multiplets of the Tb 3+ ion in yttrium-aluminum garnet in the geometry of the longitudinal and transverse Zeeman effects. The possibility of nonequilibrium population of sublevels of the (Г 1 , Г 4 ) quasi-doublet state of the 5 D 4 multiplet with energy of ∼20585 cm -1 is demonstrated in an external magnetic field.
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