Translational-Energy Spectroscopy of One-Electron Capture Processes in He²⁺–H₂ and –N₂ Collisions

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Translational energy spectra of He⁺ ions produced by one-electron capture processes in collisions of 0.8 and 2 keV He²⁺ with H₂ and 0.8 keV He²⁺ with N₂ have been measured with an electrostatic energy analyzer. The spectra show only a single broad peak with the energy gain of about 11 eV for all the cases. The peak in each spectrum becomes broader with the increase of the collision energy. It is found that the product He⁺ is in the ground state and the capture process is associated with the dissociation and/or ionization of the product molecular ion.