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The interaction between molecular (atomic) electron(s) and the vacuum fieldof a reflective cavity generates a significant interest thanks to the rapiddevelopments in nanophotonics. Such interaction which lies within the realm ofcavity quantum electrodynamic can substantially affect transport properties ofmolecular systems. In this work we consider non-adiabatic electron transferprocess in the presence of a cavity mode. We present a generalized frameworkfor the interaction between a charged molecular system and a quantizedelectromagnetic field of a cavity and apply it to the problem of electrontransfer between a donor and an acceptor placed in a confined vacuumelectromagnetic field. The effective system Hamiltonian corresponds to aunified Rabi and spin-boson model which includes a self-dipole energy term. Twolimiting cases are considered: one where the electron is assumed much fasterthan the cavity mode and another in which the electron tunneling time issignificantly larger than the mode period. In both cases a significant rateenhancement can be produced by coupling to the cavity mode in the Marcusinverted region. The results of this work offer new possibilities forcontrolling electron transfer processes using visible and infrared plasmonics

Electron transfer in confined electromagnetic fields