Charge-transfer collisions between He+2 ions and N2: Branching ratio into vibrational states

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Abstract
A plasma‐mixing device in which a helium plasma beam is crossed with a molecular nitrogen beam was used to measure the branching ratio of the excitation of individual vibrational levels of the B2Σ electronic state of the molecular nitrogen ion in charge‐transfer collisions between He+2 ions and ground‐state N2 molecules. The branching ratio of the excitation of individual vibrational levels of the C3Π electronic state of the neutral nitrogen molecule due to the resonant energy‐transfer collisions between argon metastables and ground‐state nitrogen molecules was also measured using a plasma beam of a mixture of argon and helium. These results allow comparison of our measurements with results obtained using other techniques.