Jahn-Teller Effect in ${}^{5}E_{g}$ State of ${Fe}^{2 +}$ in MgO: Observation of Tunneling Splitting and Test of the Vibronic Model for an $E$ -State Jahn-Teller Ion

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7 November 1977

journal article
research article
Published by American Physical Society (APS) in Physical Review Letters

Vol. 39 (19) , 1233-1236
https://doi.org/10.1103/physrevlett.39.1233

Abstract

Measurements of the optical absorption spectrum corresponding to the

{}^{5}T_{2 g} \to {}^{5}E_{g}

transition of

{Fe}^{2 +}

in MgO determine the principal parameters characterizing a dynamic Jahn-Teller (JT) effect in the excited

{}^{5}E_{g}

state, including the JT energy

E_{JT} ≅ 1300

{cm}^{- 1}

and tunneling splitting

3 Γ = 14

{cm}^{- 1}

. These results provide a successful test of the vibronic model for an

E

-state JT ion.

Keywords

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