Double charge transfer spectroscopy of diatomic molecules

Abstract

Translational energy spectra of H^- ions arising from single- and double-collision double charge transfer of 4 keV protons on N₂, O₂ and NO have been measured. The energy values of some double ionized states of these molecules were determined. The spin conservation rule is shown to hold strictly for these processes. Approximate selection rules bearing on the symmetry of the involved states are proposed and used for the discussion of the results.