The ratio of the radial diffusion coefficient to mobility Dr/μ has been measured for electron swarms moving through uniform electric fields in carbon monoxide and carbon dioxide for the range 3 less-than-or-eq, slant E/p less-than-or-eq, slant 500 and 10 less-than-or-eq, slant E/p less-than-or-eq, slant 550 V cm−1 Torr−1 at 0 °C respectively using the analytical methods described by Kontoleon et al (1972). The values of Dr/μ in the range E/p>50 are the first results in both the gases. The ionization coefficient α/p has been calculated from the current-growth experiments in carbon monoxide and carbon dioxide in the range 50 less-than-or-eq, slant E/p less-than-or-eq, slant 500, and the values of α in CO, in the range E/p>90, have been measured for the first time.The present experimental data obtained for carbon dioxide is used to calculate the electron energy distribution and the mean energy using the techniques described by Lucas (1969).

Measurements have been made, using recently developed experimental and theoretical techniques, of: the ratio of radial diffusion coefficient to mobility, Dr/μexp; the amplification coefficient, (λL-uL)/p; and Townsend's ionization coefficient, αT/p: for electron swarms in nitrogen for 10 less-than-or-eq, slant E/p less-than-or-eq, slant 450 V cm−1 Torr−1 at 0 °C. The results have been used for the estimation of electron energy distribution and of the mean energy for 30 less-than-or-eq, slant E/p less-than-or-eq, slant 450. It has been shown that at high E/p the distribution becomes strongly anisotropic, the degree of anisotropy being described by a coefficient δ.

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