Magnetooptical Spectroscopy of the $\sf\small ^5D_4 \rightarrow ^7F_5$ Radiative Transition of the Non-Kramers $\sf\small Tb^{3+}$ Ion in an Yttrium-Aluminium Garnet

Abstract

Spectra of luminescence and magnetic circular polarization of luminescence corresponding to the ⁵D_4̊→ ⁷F₅ radiative transition of the Tb³⁺ ion in an yttrium-aluminum garnet are studied experimentally. In the context of crystalline field theory, the energy spectrum of the ⁷F₅ multiplet of the Tb³⁺ ion in the garnet is calculated. The structure of internal energy levels of the ⁷F₅ multiplet of the Tb³⁺ ion is refined based on a comparison of the calculated results with the experimental data, and the diagram of magnetooptically active radiating transitions between ⁵D₄ and ⁷F₅ multiplet energy sublevels is constructed.