PerturbedMn2+transitions in irradiated RbMgF3:Mn

A study of the optical transitions of radiation-induced $F$-center-${\mathrm{Mn}}^{2+}$ pairs in RbMg${\mathrm{F}}_3$:Mn crystals has been made. The temperature dependence of the absorption, the emission and excitation spectra of this defect complex was investigated, and the oscillator-strength enhancement of ${\mathrm{Mn}}^{2+}$ caused by the next-neighbor radiation-induced defect determined. This oscillator-strength change, which is due to exchange interaction, is about ${10}^4$. The thermal annealing of the radiation defects is also reported.