Knowledge Bank

The ligand field states of $IrF6$, a $5d3$ octahedral molecule, offer a good opportunity to study both molecular and solid state properties. Visible and near IR absorption spectra of mixed crystals of $IrF6$ in $UF6$, $WF6$ or $MoF6$ at $2.2\circ K$ have been taken. Vibrational and electronic Raman work has been done. The $t2g$ vibration in the degenerate $\Gamma 8(Oh\ast )$ state at 0.68 microns has been reassigned on the basis of its combinations. The implications of this reassignment are discussed in terms of Jahn-Teller and vibronic coupling models. Comparisons are made with results obtained for the degenerate $\Gamma 8$ state at 1.64 microns and the Kramers^{\prime} $\Gamma 7$ state at 0.83 microns.