Measurements are reported of the triple-differential cross sections for ionization of helium by electron impact. Experimental conditions were chosen to help clarify the situation in the theory of ionization. Data are presented for primary energies of 100, 105, 125 and 165 eV. Unlike previous measurements in this energy regime, data are included for the circumstance where the three electron trajectories are not in a plane.
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Beaty et al. (1977) studied this question.
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