Correlation between experimental spectroscopic study and crystal-field calculations of Co2+ ions in α-ZnAl2S4 spinel.

Abstract The optical properties of Co2+ doped α-ZnAl 2 S 4 single crystals were investigated by Anghel et al. (2011) [1,2]. The spectra of this spinel compound consist of electronic transition d-d of Co2+ (3d7) ions. This work examines a detailed crystal-field analysis of the visible lines associated to the transitions between the Stark levels of Co2+, occupying a T d site symmetry in α-ZnAl 2 S 4 single crystals. The theoretical study is based on the Racah tensor algebra methods. With reference to the calculated energy levels of Co2+ doped α-ZnAl 2 S 4 , the electronic structure of Co2+ doped in α-ZnAl 2 S 4 was resolved. The bands appearing in the spectra are reassigned. The calculated and reassigned results are consistent with the experimental data. [ABSTRACT FROM AUTHOR]