Abstract
Previous experimental and theoretical work has found electron capture to be a monotonically decreasing function of energy in fast ion-atom collisions. We report here the experimental observation of nonmonotonic behavior of the electron-capture cross sections in fast collisions of calcium ions, in charge states 16+ to 19+, with molecular hydrogen, in the energy range 97--368 MeV. The structure observed in the measured cross sections is attributed to the contribution of resonant transfer and excitation to electron capture.
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