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FLUORESCENCE AND ABSORPTION SPECTRA OF $Ni^{2+}$ IN MgO.

Please use this identifier to cite or link to this item: http://hdl.handle.net/1811/15778

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Title: FLUORESCENCE AND ABSORPTION SPECTRA OF $Ni^{2+}$ IN MgO.
Creators: Ralph, J. E.; Townsend, M. G.
Issue Date: 1969
Abstract: The electron-beam excited fluorescence spectrum of $Ni^{2+}$ in single crystals of MgO has been recorded at 77 and $5^{\circ}K$. The observed transitions occur from the $^{1}T_{2}(t^{5}e^{3}). ^{5}T_{1}(t^{5}e^{3})$ and $^{3}T_{2}(t^{5}e^{3})$ excited terms to the $^{3}A_{2}(t^{6}e^{2})$ ground term. Comparison of the fluorescence spectrum with the recorded absorption spectrum, together with consideration of the theoretical transition probabilities, enables a differentiation between zero-phonon magnetic-dipole transitions, from spin-orbit levels of the excited terms to the ground state, and vibronic transitions. The $^{3}T_{1}(t^{5}e^{3})$ excited term is stabilised by a strong spin-orbit interaction, whilst the $^{1}T_{2}(t^{5}e^{3}$) term is split, by a Jahn-Teller interaction. The phonon density of states is derived and red-shift data for the excited terms discussed.
URI: http://hdl.handle.net/1811/15778
Other Identifiers: 1969-N-8
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