This effect is similar to the RTE, and the pseudo type of this is demonstrated in the stereochemical non-rigidity of molecules and ions as well as in fluxional behavior.
One possible cooperative example of this effect is the vibronic theory of ferroelectricity, an idea that was first suggested by Bersuker. Longuet-Higgins was responsible for the first demonstration of this effect in optic spectroscopy by calculating energy levels of a system with the E-e problem. This effect is similar to the RTE, and the pseudo type of this is demonstrated in the stereochemical non-rigidity of molecules and ions as well as in fluxional behavior. This is most often encountered in octahedral complexes of the transition metals as well as six-coordinate copper II complexes. For ten points, name this doubly-eponymous effect where non-linear molecules experience a geometrical distortion under certain conditions.
One possible cooperative example of this effect is the vibronic theory of ferroelectricity, an idea that was first suggested by Bersuker.
{Jahn}-{Teller} effect [accept {pseudo Jahn}-{Teller effect} before {Longuet} is {spoken}]