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We have measured total absolute cross sections for the Mutual Neutralization(MN) of O- with O+/N+. A fine resolution (of about 50 meV) in the kineticenergy spectra of the product neutral atoms allows unique identification of theatomic states participating in the mutual neutralization process. Crosssections and branching ratios have also been calculated down to 1 meVcenter-of-mass collision energy for these two systems with a multi-channelLandau-Zener model and an asymptotic method for the ionic-covalent couplingmatrix elements. The importance of two-electron processes in one-electrontransfer is demonstrated by the dominant contribution of a core-excitedconfiguration of the nitrogen atom in N+ + O- collisions. This effect ispartially accounted for by introducing configuration mixing in the evaluationof coupling matrix elements.

Evidence for two-electron processes in the mutual neutralization of O- with O+ and N+ at Subthermal Collision Energies