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.
| Identifer | oai:union.ndltd.org:LACETR/oai:collectionscanada.gc.ca:QMM.68652 |
| Date | January 1982 |
| Creators | Poirier, Alain |
| Publisher | McGill University |
| Source Sets | Library and Archives Canada ETDs Repository / Centre d'archives des thèses électroniques de Bibliothèque et Archives Canada |
| Language | English |
| Detected Language | English |
| Type | Electronic Thesis or Dissertation |
| Format | application/pdf |
| Coverage | Doctor of Philosophy (Department of Physics) |
| Rights | All items in eScholarship@McGill are protected by copyright with all rights reserved unless otherwise indicated. |
| Relation | alephsysno: 000151121, proquestno: AAINK60947, Theses scanned by UMI/ProQuest. |
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