Fundamental processes in collisions of O- with atoms and molecules; mechanisms of one- and two-electron loss

The authors present results of a study of O+ and O production in low-energy (10-5000 eV) collisions of O- with He, Ne, Ar, Kr, Xe, N2 and H2. An electron spectroscopy study reveals excitation of a series of singly excited autoionising states of the oxygen atom whose decay leads to O+ production. The electron spectra show that the cross section for O+ production in some cases can be appreciable even at collision energies as low as 100 eV. This is confirmed by measurements of total cross sections for one- and two-electron loss. For the N2 target, charge exchange to the N2 shape resonance is also observed.

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