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We study the generation of electronic ring currents in the presence ofnonadiabatic coupling using circularly polarized light. For this, we introducea solvable model consisting of an electron and a nucleus rotating around acommon center and subject to their mutual Coulomb interaction. The simplicityof the model brings to the forefront the non-trivial properties of electronicring currents in the presence of coupling to the nuclear coordinates andenables the characterization of various limiting situations transparently.Employing this model, we show that vibronic coupling effects play a crucialrole even when a single $E$ degenerate eigenstate of the system supports thecurrent. The maximum current of a degenerate eigenstate depends on the strengthof the nonadiabatic interactions. In the limit of large nuclear to electronicmasses, in which the Born-Oppenheimer approximation becomes exact, constantring currents and time-averaged oscillatory currents necessarily vanish.

On the Generation of Electronic Ring Currents under Vibronic Coupling Effects