A crossed-beam apparatus has been used to study charge transfer between O- ions and O2 molecules in the ground state and in the metastable, singlet delta, excited state. The energy of the incident ions ranged from 10 to 10000 eV. The cross section for charge transfer between O - and ground state O2 was found to have a maximum of 7.8X10-16 cm2 at about 5 keV. At the lower energies there is good agreement with the previous measurements of Snow et al. and Rutherford and Turner who also used crossed beam techniques. The cross section for charge transfer between O- and metastable excited O2 ( 1Δg) was found to be less than 1xl0-16 cm2 over the energy range of 100 to 5000 eV. There are no other experimental measurements for comparison.
R. F. Mathis and W. R. Snow, "Charge Transfer Between O Ions And O2 Molecules In The Ground State And Singlet Delta Excited State," The Journal of Chemical Physics, vol. 61, no. 10, pp. 4279 - 4284, American Institute of Physics, Jan 1974.
The definitive version is available at https://doi.org/10.1063/1.1681730
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01 Jan 1974