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Electron detachment from O−2 ions in oxygen: the effect of vibrational excitation and the effect of electric field

Electron detachment from O−2 ions has been theoretically studied in oxygen (i) when the gas is vibrationally excited and (ii) when the ions are heated in a strong external electric field. Assuming that electron detachment proceeds via the formation of vibrationally excited temporary O−2 ions, the detachment rate was determined on the basis of the statistical approach for the vibrational transfer and relaxation in collisions between O−2 ions and O2 molecules. The approach used in our previous work to study electron detachment in vibrationally excited oxygen was amended to take into account the conservation of total angular momentum in O−2–O2 collisions. The calculated detachment rates agree well with available measurements in oxygen under equilibrium conditions. The method was used to calculate detachment rates under strongly non-equilibrium conditions in which the vibrational temperature of molecules or ion translational temperature is elevated. The obtained results were compared with available measurements in drift tubes.