Luminescence excitation spectra of Mn2+ in synthetic forsterite |
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Authors: | G. R. Green G. Walker |
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Affiliation: | 1. Department of Pure and Applied Physics, University of Manchester Institute of Science and Technology, M60 1QD, Manchester, United Kingdom
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Abstract: | Detailed ligand-field spectra of Mn2+ in both microcrystalline and single-crystal synthetic forsterite are obtained using the technique of luminescence excitation spectroscopy. It is shown that Mn2+ has an almost exclusive preference for one particular cation site which is most probably the M2 site. Low temperature measurements reveal a no-phonon (purely electronic) transition at 16,260 cm?1 (615 nm) which is the energy of the lowest split component of the 4 T 1(G) state above the ground state. Phonon replicas of this transition are evident showing that a particular phonon mode (180 cm?1) is dominantly involved. An analysis of the polarized spectra of Mn2+ in single-crystal forsterite shows the choice of C 2v (C 2, σ d ) pseudosymmetry for the M2 site yields the best agreement with the polarization dependence of the transitions between the ligand-field states of the Mn2+ ion in this site. |
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