A Review of the Jahn-Teller Effects (Jahn -Teller, Renner-Teller, and Pseudo Jahn -Teller): The main origin of instability and symmetry breaking of molecular systems
Subject Areas :
Ghazaleh
Kouchakzadeh
1
(Department of Chemistry - Faculty of Science- Islamic Azad University- Khorramabad branch- Khorramabad)
Keywords: " Jahn- Teller effect", "Vibronic coupling", "Renner- Teller effect", "Symmetry breaking", "Pseudo Jahn- Teller effect", "Molecular properties",
Abstract :
The study of the origin of equilibrium geometry of systems has a long history. Any system wants to stay in a stable state; therefore, the systems are converted from the configuration of high symmetry to the configuration of low symmetry. The origin of systems instability is due to the Jahn-Teller effect. In fact, the Jahn-Teller effect consists of the Jahn -Teller, the Renner-Teller, and the pseudo Jahn –Teller properties. The Jahn- Teller effect is an important mechanism of symmetry breaking in molecular and solid- state systems. The vibronic coupling between the ground state and excited states along the nuclear displacements is assumed as a perturbation, which changes the configuration of systems from a planar geometry with a high symmetry to the bending equilibrium geometry with a lower symmetry. The bending has a significant effect on the prediction of spectroscopic and molecular properties of the systems, as electrical, magnetic, conductivity properties and some other properties can change.
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