Abstract
Polarized optical absorption and emission measurements are used to locate and assign 60 crystal-field energy levels split out of the 4f8 electronic configuration of Tb3+ in single crystals of Na3[Yb0.95Tb0.05(dpa)3]·NaClO4·10H2O (where dpa ≡ dipicolinate dianion ≡ 2,6-pyridinedicarboxylate). In these crystals, each Tb3+ ion is coordinated to three dipicolinate (dpa) ligands, and the tris-terdentate Tb(dpa)33- chelate structures have trigonal-dihedral (D3) symmetry. The combined optical absorption and emission measurements provide access to the energy-level structures of the 17 lowest-energy 4f8[SL]J multiplet manifolds of Tb3+, and all of these multiplet manifolds are represented among the 60 crystal-field levels that are characterized with respect to both location (energy) and symmetry properties. The energy-level data obtained from experiment are analyzed in terms of a model Hamiltonian that includes consideration of both isotropic and nonisotropic 4f-electron/crystal-field interactions. A parametrized ...
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