We have performed kinematically complete experiments on single-electron capture in slow He2+-Ar collisions. Besides the pure capture to the He+ (n = 2) level, capture into the deep He+ ( n= 1) state with simultaneous excitation of another target electron is also observed. In contrast to the pure capture, the total cross section for this two-electron transition decreases with increasing collision energy, and its angular-differential cross section exhibits a much slighter slope. We take these observations as evidence for electron capture mediated by electron-electron interactions.
Z. Y. Song et al., "Evidence for Target Outer-Shell Excitation Mediated by Electron Correlation in Single-Electron-Capture Collisions of Slow He²⁺ Ions with Ar Atoms," Physical Review A, vol. 102, no. 4, American Physical Society, Oct 2020.
The definitive version is available at https://doi.org/10.1103/PhysRevA.102.042820
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28 Oct 2020