The coupling can be observed spectroscopically and is most easily seen in the Renner–Teller effect in which a linear polyatomic molecule is in a degenerate electronic state and bending vibrations will cause a large rovibronic coupling.
The interaction can be detected spectroscopically, and is prominently illustrated by the Renner–Teller effect. A linear polyatomic molecule with degenerate electronic states experiences significant rovibrational coupling due to bending vibrations.