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Polarized two-photon excitation (TPE) and emission spectra have been used to locate, and identify the symmetry of, more than 100 energy levels of terbium(III) in the elpasolite Cs2NaTbCl6. These are assigned with the aid of a one-electron crystal field Hamiltonian. In many cases the assignments were verified by modelling the Zeeman interaction. Systematic deviations from the predictions of the one-electron model provide evidence for electron correlation induced by the crystal field (CCF).
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Morrison et al. (1999) studied this question.
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