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

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 Title: FLUORESCENCE AND ABSORPTION SPECTRA OF $Ni^{2+}$ IN MgO. Creators: Ralph, J. E.; Townsend, M. G. Issue Date: 1969 Publisher: Ohio State University 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. Description: Author Institution: Mullard Research Laboratories, Redhill, Surrey; Department of Energy, Mines and Resources Mines Branch URI: http://hdl.handle.net/1811/15778 Other Identifiers: 1969-N-8