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- W1996469061 abstract "The problem of an (ns)2 ion in an isolated regular octahedron of ligands with an Alg ground state and a Tlu excited state is solved exactly for the case of the linear vibronic coupling approximation and a harmonic potential energy. The excited state is susceptible to a T(X)( tau 2g+ epsilon g) Jahn-Teller effect (JTE). Three regimes can be found: (i) The difference in energy between the ground and excited states exceeds a certain threshold, so that the interaction does not result in instability. The Alg level is the ground state. (ii) The excited state has a very strong JTE, so that its energy is lowered far below the Alg state. (iii) There is strong interaction between the two levels, a pseudo-Jahn-Teller effect (PJTE) mixes the excited state into the ground state and a dipole moment arises. Through the mixing-in of the excited state, the tau 2g or epsilon g deformations are also present in the ground state. Only trigonally or tetragonally deformed octahedra with an additional dipolar distortion in the case of a PJTE are expected. A condition for strong PJTE is derived, which is shown to be reached more easily for two electrons than for one electron in the ground state." @default.
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- W1996469061 date "1991-01-07" @default.
- W1996469061 modified "2023-10-16" @default.
- W1996469061 title "A combined Jahn-Teller and pseudo-Jahn-Teller effect: an exactly solvable model" @default.
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- W1996469061 doi "https://doi.org/10.1088/0953-8984/3/1/003" @default.
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