Both single (TES) and double (DTES) translational energy spectroscopy has been used to study one-electron capture processes by N2+, C2+, He2+, N5+, and O6+ ions in H-2 and CO at energies < 1keV/amu. The main excited product channels have been identified. In the case of He2+ in H-2 and CO, one electron capture with dissociation becomes increasingly important as the collision energy is decreased. In the case of N5+ in H-2, autoionising double capture with dissociation is an important process at the lowest energies considered. All the measurements are in good agreement with theoretical predictions where available.