Production of vibrationally excited O+2 in the reaction of O+ with CO2

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Abstract
The production of vibrationally excited O+2 in the reaction of O+ with CO2 has been studied as a function of temperature. The measurements were made in a variable temperature-selected ion flow drift tube by the monitor ion technique. The principal vibrational level produced is found to be O+2(v=1), with approximately 45%–51% of the O+2 produced in this state. The remainder is O+2(v=0), representing 23%–43%, and O+2(v≥2), representing 6%–32%. More vibrational excitation is observed at higher temperature, but this temperature dependence may be obscured due to vibrational quenching. The various vibrational levels of O+2 observed here were found to react with Xe at different rates, with O+2(v=1) having the largest rate constant. Rate constants for several reactions pertinent to this study are also reported.