Charge transfer and Penning ionization of N2, CO, CO2, and H2S in proton excited helium mixtures

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Abstract
In this work we report on studies of the kinetics of He–N2 mixtures excited by a proton beam. The rate of charge transfer from both atomic and molecular helium ions to N2 was studied using a time‐resolved technique to measure the fluorescence of N+2(B 2Σ+u→X 2Σg). The population of N+2(B2Σ+u) through a Penning ionization process from metastable helium atoms or molecules is observed, and the Penning ionization and charge transfer process which populates this state in a He–N2 laser is discussed. The charge transfer rate constants of He+–CO, He+–CO2, He+–H2S, and He+2–CO are also measured.