  We discuss the photon emission that occurs due to the radiative recombination
of an electron on a nearby center after tunneling ionization. The model of an
active electron is used, and analytical solution to three-dimensional problem
is obtained. The dependence of the photon emission from a distance between
centers of ionization and a recombination, and also the electric field
orientation are investigated. The formulas for probability of recombination
radiation are derived.
