Jahn–Teller effect

Jahn–Teller effect
Molecular distortions due to an electronically degenerate ground state. For non-linear molecular
entities in a geometry described by a point symmetry group possessing degenerate irreducible
representations there always exists at least one non-totally symmetric vibration that makes
electronically degenerate states unstable at this geometry. The nuclei are displaced to new equilibrium
positions of lower symmetry causing a splitting of the originally degenerate states (first-order Jahn–
Teller effect).

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