Ion-Beam Excitation Effects on the Single Charge Transfer between Argon and Nitrogen

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Abstract
Single charge‐transfer cross sections for N2+ in argon and Ar+ in molecular nitrogen and argon have been measured as functions of ion energy and of ion‐source electron energy. Ion energies studied were in the range of 50 to 1000 eV. The ion‐source electron energy was varied from 16 to 24 eV for the N2+ ions, and 16 to 40 eV for Ar+. For the Ar++N2 case, the cross section appeared to be nonresonant and was insensitive to ionizing electron energy. The slightly endothermic charge transfer for the N2++Ar case also appeared to be nonresonant, but was measurably influenced by ion‐source electron energy. This result is attributed to the presence of long‐lived excited states of N2+ reported earlier. Evidence is presented to show that the (N2+)* ions exhibit near‐resonant behavior in charge transfer with argon atoms. This suggests that the effect is due to an increased population of vibrational states v=1, 2 at higher electron energies.

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