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. 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}]