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Optical absorption spectra, crystal-field energy levels and intensities of Eu3+ in GdAl3(BO3)4

Locations and assignments of crystal-field levels in polarized absorption spectra (77 and 298 K) are reported for Eu3+ in the GdAl3(BO3)4 huntite matrix. The levels are analysed in terms of 20 free-ion and six crystal-field parameters (D3 symmetry). J mixing is taken into account. The influence of a parameter change on the calculated energy levels is discussed and it is shown that some parameters affect only particular levels. Spectral intensities of the 4f-4f transitions are given and parametrized using a set of Blambda kq intensity parameters.