Charge transfer reactions of ground O+(4S) and excited O+(2D) state ions with neutral molecules

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Abstract
Total charge transfer cross sections have been measured for the reactions of 0.6 to 3.0 keV O+(4S) and O+(2D) ions with Ar, H2, N2, O2, CO, NO, and CO2. Time‐of‐flight techniques have been used to measure the fast neutral O products from charge transfer reactions in which reactant O+ ion beams have been produced by controlled electron impact ionization of oxygen. Reactions have been examined as a function of the electron energy used to produce the reactant ions and reaction cross sections determined for ground O+(4S) and excited O+(2D) state ions. The cross sections for charge transfer reactions involving the excited O+(2D) ions are significantly larger than the corresponding reactions of ground state ions in each of the above systems with the exception of CO2 where the revserse situation occurs due to small energy defects and favorable vibrational overlaps for reactions of O+(4S) ions.