Measurements have been made of the electron ionization coefficient η in helium-hydrogen and neon-hydrogen gas mixtures over an extended range of Ep₀ values. The present results show a variation of η with Ep₀ and hydrogen concentration similar to that previously obtained by Kruithof and Penning for the case of neon-argon mixtures. The maximum values of η observed of 0.0302 and 0.0285 V^-1 were obtained for hydrogen concentrations of 0.1% and at Ep₀ (V/cm×{}Torr) values of 15.0 and 3.0 for helium-hydrogen and neon-hydrogen mixtures, respectively. Comparison is made of these results with the neon-argon measurements of Kruithof and Penning. In addition, the present data are compared with ionization measurements obtained using other techniques.
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Chanin et al. (1964) studied this question.
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