The reaction sequence leading from O2+ to H3O+· H2O was examined in He, Ar, N2, and O2 carrier gases in a flowing afterglow system. The rate constants for the reactions were measured and the kinetic analysis for their determination is presented. For M=N2, two new steps involving the formation and reaction of O2+· N2 were proposed and examined. The rate constants are discussed and compared with other experimental values.

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