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Recent radio frequency scanning tunneling spectroscopy (rf-STS) experimentshave demonstrated nuclear and electron spin excitations up to $\pm12\hbar$ in asingle molecular spin quantum dot (qudot). Despite the profound experimentalevidence, the observed independence of the well-established dipole selectionrules is not described by existing theory of magnetic resonance -- pointing toa new excitation mechanism. Here we solve the puzzle of the underlyingmechanism by presenting all relevant mechanistic steps. At the heart of themechanism, periodic transient charging and electric polarization due to therf-modulated tunneling process cause a periodic asymmetric deformation of thequdot, enabling spin transitions via spin-phonon-like coupling. The mechanismhas general relevance for a broad variety of different spin qudots exhibitinginternal mechanical degrees of freedom (organic molecules, doped semiconductorqudots, nanocrystals, etc.).

Mechanism for nuclear and electron spin excitation by radio frequency current