Electron energy spectra obtained from the He⁺-He collision system at 1400-eV impact energy and at a laboratory emission angle of 180^∘{} show pronounced oscillatory structure. By comparison with calculated spectra using a simple potential-curve model, we show that the observed structure is due to an interference between the electron-emission amplitudes of different coherently excited autoionizing states.
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Morgenstern et al. (1976) studied this question.
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