Abstract
Translational energy spectroscopy is being used for detection of long-lived highly excited Ar 2+ ions, produced in an electron impact ion source, by means of state-selective single-electron stripping processes in collisions of 2–8 keV Ar 2+ ions with rare-gas atoms. Translational energy-loss spectra indicate that stripping of a single electron from Ar 2+ occurs predominantly by a reaction channel due to ionization of long-lived highly excited states with excitation energies very close to the ionization potential of Ar 2+. This reaction channel is found to be overwhelmingly dominant at electron impact energies, E e ≥ 87 eV, in the electron impact ion source. Weaker processes are also observed due to ionization of highly excited metastable, low-lying metastable, and the ground state of Ar 2+ ions.
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