Electronic raman spectroscopy of iron doped MgO

• Main Author: Poirier, Alain
• Format: Others
• Language: en
• Published: McGill University 1982
• Subjects: Raman spectroscopy.; Ions > Spectra.; Iron ions.
• Online Access: http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=68652

The nearby excited states of Fe('2+) in MgO have been observed by Raman spectroscopy for the first time. We observed an A(,1g) impurity mode (185 cm('-1)) and an electronic transition at 110.5 (+OR-) .8 cm('-1) which we associate with the first excited states of the ferrous ion, (GAMMA)(,3g) and (GAMMA)(,4g), previously observed by far infra-red optical absorption. === Crystal field theory and group theory are used to characterize the energy levels and the wavefunctions of the ferrous ion. The observed reduction in the spin-orbit splitting of the energy levels is accounted for by solving the Jahn-Teller Hamiltonian in the approximation of the cluster model. === Uniaxial stress applied to the MgO:Fe('2+) samples produced a shift in the observed electronic transitions. The stress Hamiltonian is solved from which is extracted the experimental value of the strain coupling coefficient to E(,g) deformation (V(,2) = 7140 (+OR-) 1800 cm('-1)) which led, ultimately, to the Jahn-Teller coupling coefficients and to the Jahn-Teller energies ((E(,JT))(,E) = 80 cm('-1) and 3/2(E(,JT))(,T) = 150('-1)) pertinent to the ferrous ion in MgO.