Determination of intensity parameters from the fine details of the Stark structure in the energy spectrum of Tm3+ ions in Y3Al5O12

Analysis of the structure of the energy spectrum of Tm3+ ions in Y3Al5O12 is performed in terms of the approximation of intermediate-force configuration interaction. The parameters of the even and odd crystal fields and the covalence parameters are determined. When the interconfiguration interaction is taken into account, the description of the energy spectrum becomes more adequate and the root-mean-square deviation decreases by 25%. The intensity parameters calculated using the odd crystal field and covalence parameters are in satisfactory agreement with experimental values. It is concluded that, on the basis of the analysis of the Stark structure of an energy spectrum, the intensity characteristics can be quantitatively estimated.