  We study electron transfer between two separated nuclei using local control
theory. By conditioning the algorithm in a symmetric system formed by two
protons, one can favored slow transfer processes, where tunneling is the main
mechanism, achieving transfer efficiencies close to unity assuming fixed
nuclei. The solution can be parametrized using sequences of pump and dump pi
pulses, where the pump pulse is used to excite the electron to a highly excited
state where the time for tunneling to the target nuclei is on the order of
femtoseconds. The time delay must be chosen to allow for full population
transfer via tunneling, and the dump pulse is chosen to remove energy from the
state to avoid tunneling back to the original proton. Finally, we study the
effect of the nuclear kinetic energy on the transfer efficiency. Even in the
absence of relative motion between the protons, the spreading of the nuclear
wave function is enough to reduce the yield of electronic transfer to less than
one half.
