Nonadiabatic tunneling in the presence of an oscillating field

Nonadiabatic tunneling is an effect occurring when two potentials are crossing each other with opposite slopes. It is characterized by the vanishing of the transmission probability at a set of energies (or nodes) that can be identified as the resonance energies of the system. We investigate the modification of this probability induced by the interaction of the particle with an oscillating field. The main result of this study is the presence of additional dips in the transmissivity, representing replicas of the nodal structure. They are due to processes implying an absorption (or emission) followed by an emission (or absorption) of one or even more than one quantum.