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• W1990616063 endingPage "567" @default.
• W1990616063 startingPage "548" @default.
• W1990616063 abstract "Measurements by Wong of the far-infrared absorption spectrum of the ${mathrm{Fe}}^{2+}$ ion at undistorted cubic sites in MgO have revealed that the first excited spin-orbit level (evidently comprising both the ${ensuremath{Gamma}}_{3g}$ and ${ensuremath{Gamma}}_{4g}$ states) lies 105 ${mathrm{cm}}^{ensuremath{-}1}$ above the ${ensuremath{Gamma}}_{5g}$ ground state, in contrast to the value ensuremath{sim}200 ${mathrm{cm}}^{ensuremath{-}1}$ predicted by crystal-field theory. A calculation has been made to determine if this reduced spin-orbit splitting can reasonably be attributed to a dynamic Jahn-Teller effect without leading to inconsistencies with other EPR and Mossbauer data for MgO: ${mathrm{Fe}}^{2+}$. It is concluded that this reduction is indeed predominantly the result of the Jahn-Teller coupling, that this reduction is consistent with the strength of Jahn-Teller coupling indicated by strain data for the ${ensuremath{Gamma}}_{5g}$ level, and that significant Jahn-Teller corrections occur also in other parameters which characterize the EPR and Mossbauer spectra, such as the $g$ factor, hyperfine field, and nuclear quadrupole coupling coefficients of the ${ensuremath{Gamma}}_{5g}$ level. These Jahn-Teller corrections are calculated using the strength of the Jahn-Teller coupling to both ${E}_{g}$ and ${T}_{2g}$ vibrational modes as parameters, which are adjusted to give the observed spin-orbit reduction, and the resulting values are compared with estimates of corrections resulting from covalency. The calculations are carried out by treating the Jahn-Teller interaction by perturbation methods, and the calculation is formulated both for coupling with discrete vibrational modes and also for coupling with the continuum of lattice phonons." @default.
• W1990616063 created "2016-06-24" @default.
• W1990616063 creator A5039439159 @default.
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• W1990616063 date "1969-09-10" @default.
• W1990616063 modified "2023-10-09" @default.
• W1990616063 title "Jahn-Teller Effects in the Far-Infrared, EPR, and Mössbauer Spectra of MgO:<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msup><mml:mrow><mml:mi mathvariant=normal>Fe</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:mrow></mml:math>" @default.
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• W1990616063 doi "https://doi.org/10.1103/physrev.185.548" @default.
• W1990616063 hasPublicationYear "1969" @default.
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