Abstract The impact ionization of a rarefied gas by high-energy electrons is considered. An approximate hydrodynamic model of the current density of low-energy secondary electrons formed during impact ionization is constructed. The concentration, drift velocity, and specific energy are calculated by an approximate solution of the kinetic equation for secondary electrons. Spatial homogeneity, isotropy of the initial distribution of secondary electrons, coincidence of the direction of their drift and the electric field are assumed. Additional approximations are related to the structure of the distribution function of secondary electrons and cross section averaging. The results of model validation by comparison with direct collision simulation are presented.
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