OPTICALLY DETECTED MAGNETIC RESONANCE OF Mn(IV) HEXAFLUORIDE IN Cs2GeF6 AND K2GeF6
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Date
1988
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Ohio State University
Abstract
The photoexcitation and luminescence spectra $(^{2}E \longrightarrow ^{4}A_{2})$ of $MnF_{6}{^{2-}}$ diluted in $Cs_{2}GeF_{6}$ and $K_{2}GeF_{6}$ host lattices have been recorded at liquid helius temperature. The manganese coordination geometry is Oh, in $Cs_{2}GeF_{6}$ and $D_{3d}$ in $K_{2}GeF_{6}$. Optically detected magnetic resonance (ODMR) has been employed to determine the g-value of the $^{2}E$ state in both coordination geometries. The trigonal distortion has a pronounced effect on the g-values and produces a measurable splitting in the optical spectrus, but exerts relatively little effect on the radiative lifetime. In particular. the g-value in the oh site $(g(^{2}E)-2.0)$ is as predicted theoretically; however, the value obtained for the D3d site is unexpectedly large $(g(^{2}E)-2.95)$. The data obtained is compared with theoretical predictions and the results of similar studies of $d^{3}$ ions in a variety of lattices. The differences are shown to arise, in part, from the relative magnitude of the spin-orbit coupling and the trigonal field splitting in the $^{2}E$ state
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Author Institution: Department of Chemistry, University of Michigan