= Renner–Teller effect
{wiki=Renner–Teller_effect}
The Renner-Teller effect is a phenomenon in molecular physics and spectroscopy that occurs in polyatomic molecules with degenerate electronic states. It is a blending of the Renner effect and the Teller effect, which describe how molecular vibrations and electronic states interact, leading to splitting of energy levels. Specifically, the Renner-Teller effect is most notable in systems where the degeneracy of electronic states is lifted due to coupling between electronic and vibrational states.
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