Abstract
We use the Schwinger multichannel method with pseudopotentials to study low energy ${e}^{\ensuremath{-}}\ensuremath{-}{\mathrm{Na}}_{2}$ scattering. Our cross sections, for impact energies from 0 to 10 eV, include polarization effects and up to 25 open channels related to all electronic states lying below 3.5 eV. Our results predict prominent threshold effects due to a very intense coupling between the ${B}^{1}{\ensuremath{\Pi}}_{u}$ state and the elastic channel in an energy region where there is no experimental data. Our total 25-state cross sections are in very good agreement with available experimental data for energies below about 4 eV.
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