Theory of initial yields of ions generated by electrons in binary mixtures

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Abstract
Interactions of charged particles with matter concerns most often mixtures or chemically impure substances. This paper presents the first rigorous treatment of the ionization yields in a binary mixture of gases A and B in the absence of energy transfer between molecules. The Fowler equation was used, and as a first example the system Ar–H2 was studied. Results for the number of all ions N and for the number of ions of types A or B are presented for incident electron energies T up to 2000 eV. The calculations cover the complete range of the mixture composition. Comparison with available experimental data shows excellent agreement. The mean numbers of Ar and H2 ions present a very interesting dependence on the concentration of the species; their ratio is approximately proportional to the ratio of their partial concentrations.