Abstract
Polarized two-photon excitation (TPE) and emission spectra are presented for terbium(III) in the elpasolite Cs2NaTbF6. Almost 90 levels of unambiguous symmetry have been assigned up to 35 000 cm−1 with the aid of a one-electron crystal field Hamiltonian. This represents the most complete and extensive data set so far reported for a lanthanide ion at a cubic site. Large deviations from the predictions of the one-electron crystal field model are observed in the splitting of a number of multiplets. These are discussed in terms of the correlation crystal field (CCF).
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