Bellm, Susan; Lower, Julian; Bartschat, Klaus R; Guan, X.; Weflen, D; Foster, M.; Harris, A.L.; Madison, Don Harvey
We present experimental and theoretical results for the electron-impact-induced ionization of ground-state helium atoms. Using a high-sensitivity toroidal electron spectrometer, we measured cross-section ratios for transitions leading to the first three excited states of the residual helium ion relative to the transition leaving the ion in the ground state. Measurements were performed for both symmetric- and asymmetric-energy-sharing kinematics. By presenting results as a ratio, a direct...[Show more]
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