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Electron transfer in collisions of low-energy negative oxygen ions with O2

Total cross sections for the production of slow negative ions in collisions of O− and O2− ions with O2 molecules have been measured for incident ion energies in the range 4 to 100 eV, using a single-collision beam technique. Over the whole energy range for O2− and for O− energies greater than approximately 35 eV the dominant contribution to the cross section is attributed to simple charge transfer, while, for low-energy O− beams, elastic scattering has an important effect. The results are compared with those of Rutherford and Turner and Bailey and Mahadevan and reasons are suggested for the large discrepancies which appear for O− in O2 cross sections.