Translational energy spectrum of O2-ions formed by 4 keV O2+ions impacting on argon

Abstract
The translational energy spectrum of O2- arising from single and double collision double charge transfer between 4 keV O2+ ions and Ar atoms has been recorded. The incident O2+ ions are found to be either in the ground x2 Pi g state or in the metastable a4 Pi u state. The single-collision double charge transfer is observed only from metastable O2+ ions, ground state O2+ leading to autodetaching levels of O2-. This result gives evidence on the validity of Franck-Condon principle for molecular transitions occurring in double charge transfer processes.

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