Abstract
The free ion energy level parameters ofYb2+ are obtainedby fitting the 4f135d Yb2+ free ion energy levels. A model is proposed for scaling these parameters so that they are appropriatefor Yb2+ in crystals. Treating the scaling factor, the barycenter energyEexc ofthe 4f135d configuration, and the crystal-field splitting parameterB4(dd) as free parameters and adopting the 4f crystal-field parameters of the4f13 configuration Yb3+ ion in other hosts with the same ligands, the absorption spectra ofYb2+ inMX (M = K, Na; X = F, Cl, Br, I) hosts are well simulated. A model is proposed for taking the effect of chargecompensation into account and this shows that the inclusion of charge compensation effectsdoes not significantly alter the calculated electronic absorption spectra but mayconsiderably change the dynamics of the system.
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