Abstract
The ultraviolet absorption spectrum of a crystal of Cs2NaTbCl6 has been recorded at 15 and 35K. Spectral features have been assigned to magnetic dipole zero phonon lines and TbCl63- moiety mode vibronic structure. A comparison is made of the derived electronic energy level scheme with that from two-photon excitation experiments and the agreement is good. The differences in spectral selection rules for these two approaches are highlighted.
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