Experimental and calculated energy levels of Sm2+:BaClF

Abstract

New investigations on the optical properties of divalent samarium in barium chlorofluoride single crystals have been performed. As a result, an energy level diagram including 42 Stark components of the ⁷F_J and ⁵D_J multiplets of the 4f⁶ configuration has been deduced from the excitation and fluorescence spectra. Parameter optimizations involving combined spin–orbit and crystal‐field interactions have been achieved from the experimental Stark levels of the ⁷F ground term. An interpretation of the fitted crystal‐field parameters has been developed in the framework of an additive ligand‐field model. The irreducible tensor method applied to the chain O₃⊆C_∞v⊆C_4v⊆C_2v is used throughout this paper.