Measurement and simulation of the energy levels of R=Pr3+ and Nd3+ in GaRGe2O7

摘要: Abstract The optical absorption spectra of GaRGe 2 O 7 , R=Pr, Nd, have been measured, on polycrystalline powders, at 9 K. These compounds are monoclinic, space group P2 1 /c and in them R 3+ occupies a single crystallographic position with C point symmetry. From the crystal field analysis spectra, energy level schemes an expression associated wavefunctions for 4f 3 configurations derived. semi-empirical simple overlap model is used to calculate initial set crystal-field parameters from structure. fitting experimental Stark energies phenomenological calculation were performed approximate s (C ) Very satisfactory correlations obtained between calculated levels, root mean square deviations σ =14.1 15.7, respectively, despite very low symmetry matrix, similarity both sets indicates consistence these calculations.