Abstract
The semi-empirical method for determining electron impact cross sections is used to determine sets of collision cross sections for helium. The parameters are evaluated using experimental angular distribution data, total cross section data, high-energy experimental generalized oscillator strengths, and theoretical optical oscillator strengths. The results for total excitation and ionization cross sections are also presented in a simplified empirical form that is more convenient for applications to electron loss calculations. The analysis points to remaining questions of consistency of data that will have to be resolved by future experiments or more refined theoretical calculations.
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