Absorption and electronic Raman scattering spectra of the Γ_8g (²T_1g) state of IrF₆ at 1·6 μ—a resolution of the Jahn-Teller problem

Abstract

Electronic Raman scattering and absorption spectra are presented which allow an interpretation of the vibronic structure of the Γ_8g (² T _1g ) excited electronic state of IrF₆ at 1·6 μ. Large splittings and shifts are observed for the Jahn-Teller active v ₂ (e_g ), v ₅ (t _2g ), and 2v ₅ vibrations. From these spectra linear (D ₂ and D ₅) and quadratic (Q ₂ [a _1g ], Q ₂ [e_g ], Q ₅ [a _1g ], Q ₅ [t _2g ]) Jahn-Teller parameters can be determined. These data are compared with parameters previously obtained for the ReF₆ ground state and the IrF₆ Γ_8g (² T _2g ) state at 0·6 μ.