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In this work, we have performed an experimental/theoretical study of state selective charge exchange cross sections in 1-10 keV/amu Ne8+ +Na(3s) collisions. Theoretical calculations provided by the classical trajectory Monte Carlo method (CTMC) are contrasted to data obtained at KVI by means of the magneto-optical trap recoil-ion momentum spectroscopy technique (MOTRIMS). We find that for electron capture to n  10, a two-step mechanism which involves an initial electronic excitation followed by electron capture at a later stage of the collision applies. Oscillatory structures in the n-state selective capture cross sections and recoil ion transverse momentum distributions are present in the experimental data as well as in the theoretical results, and are ascribed to the number of swaps the electron undergoes across the potential energy saddle during the collision process.Fil: Otranto, Sebastian. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico - CONICET -  Bahía Blanca. Instituto de Física del Sur; Argentina. Universidad Nacional del Sur. Departamento de Física; ArgentinaFil: Blank, I.. Kernfysisch Versneller Instituut. Atomic Physics; Países Bajos;Fil: Olson, R. E.. Missouri University of Science and Technology. Physics Department; Estados Unidos de América;Fil: Hoekstra, R.. Kernfysisch Versneller Instituut. Atomic Physics; Países Bajos

Oscillatory patterns in angular differential ion-atom charge exchange cross sections: The role of electron saddle swaps