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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Green, G.R., Walker, G. Luminescence excitation spectra of Mn2+ in synthetic forsterite. Phys Chem Minerals 12, 271–278 (1985). https://doi.org/10.1007/BF00310339
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DOI: https://doi.org/10.1007/BF00310339