Positive ion production in halogen negative ion collisions

Presents the results of electron spectroscopy and total cross section measurements of one- and two-electron loss processes in collisions of halogen negative ions with various gases for collision energies below 5 keV. The electron spectroscopy study illustrates that the production of singly excited autoionising states of the halogen atoms can be important for energies as low as 100 eV and is responsible for positive ion production, as has been also recently shown for O- collisions by Penent et al. These conclusions concerning positive ion production should also be applicable to collisions involving the parent atoms, being a characteristic of these systems rather than that of the negative ion.

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