  We describe the major low-energy electron-impact processes involving H$^+_2$
and HD$^+$, relevant for the astrochemistry of the early Universe: Dissociative
recombination, elastic, inelastic and superelastic scattering. We report cross
sections and Maxwellian rate coefficients of both rotational and vibrational
transitions, and outline several important features, like isotopic, rotational
and resonant effects.
