Jahn-Teller Splittings in the Optical Absorption Spectra of Divalent Iron Compounds

Abstract

Measurements of the Jahn-Teller splittings of the ${}_{}{}^5{}_{}{}^{}T_{2g}^{}{}_{}{}^{}\left({}_{}{}^5{}_{}{}^{}D\right)\to {}_{}{}^5{}_{}{}^{}E_g^{}{}_{}{}^{}\left({}_{}{}^5{}_{}{}^{}D\right)$ optical transition of divalent iron in the near infrared are reported for Fe${\mathrm{F}}_2$, KFe${\mathrm{F}}_3$, KMg${\mathrm{F}}_3$:${\mathrm{Fe}}^{2+}$, FeSi${\mathrm{F}}_6$:6${\mathrm{H}}_2$O, Fe${\mathrm{Cl}}_2$, and MgO:${\mathrm{Fe}}^{2+}$. The effect of the site symmetry of the ferrous ion on the magnitude of the splittings observed is discussed.