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Charge transfer in keV O+(4S, 2D, 2P)-He collisions B. G. Lindsay and R. F. Stebbings Phys. Rev. A 67, 022715 (2003) Absolute differential cross sections (DCSs) are reported for charge transfer scattering of 1-5 keV O+(4S) ground state and O+(2D, 2P) metastable state ions by helium atoms at angles between 0.2° and 6.3° in the laboratory frame. Estimated ground-state and metastable-state total cross sections are derived from these measurements. The present ground-state cross sections agree satisfactorily with previous measurements for energies above 2 keV and the metastable-state cross sections are consistent with the mixed-state data of Kusakabe et al. [J. Phys. Soc. Japan 59, 1987 (1990)]. The large differences between the ground- and metastable-state cross sections predicted by theory are not observed. |