GROUP-CHAIN SCHEME ANALYSIS OF THE ENERGY LEVELS AND MAGNETIC PROPERTIES OF Nd³⁺ IN LiYF₄ CRYSTAL

Based on the analysis of group-chain scheme, the crystal-field-level fitting of Nd³⁺: LiYF₄ has been carried out, in which the Nd³⁺ inos occupy positions with site symmetry S₄. The RMS deviation of energy-level fitting is 12.8cm^-1. Using the obtained wave functions, g-factors of the fround state are calculated,which are g_∥=2.067 and g_⊥=2.631, in good agreement with the experimental values(g_∥=1.978 and g_⊥=2.554). The method proposed turns out to be effective in the study of spectral properties of localized centres in laser crystals.