  Electron-positron pair production is considered for many-center systems with
multiple bare nuclei immersed in a constant electric field. It is shown that
there are two distinct regimes where the pair production rate is enhanced. At
small interatomic distance, the effective charge of the nuclei approaches the
critical charge where the ground state dives into the negative continuum. This
facilitates the transition from the negative to the positive energy states,
which in turns, increases the pair production rate. At larger atomic distance,
the enhancement is due to the crossing of resonances and the pair production
proceeds by the Resonantly Enhanced Pair Production (REPP) mechanism. These
processes are studied within a simple one-dimensional model. A numerical method
is developed to evaluate the transmission coefficient in relativistic quantum
mechanics, which is required in the calculation of the pair production rate.
The latter is evaluated for systems with many (up to five) nuclei. It is shown
that the production rate for many-center systems can reach a few orders of
magnitude above Schwinger's tunnelling result in a static field.
