The ratio of the radial diffusion coefficient to mobility Dr/ mu exp has been measured for the first time in five gases at high E/N (ratio of electric field to gas number density). The range of E/N was as follows: helium 3

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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).

Experimental results are presented of ionisation ( alpha ) and electron attachment (( eta ) coefficients evaluated from the steady-state Townsend current growth curves for SF6N2 and CCl2F2-N2 mixtures over the range 60

The ratio of the electron attachment coefficient eta to the gas pressure p (reduced to 0 degrees C) evaluated from the Townsend current growth curves in binary mixtures of electronegative gases (SF6, CCl2F2, CO2) and buffer gases (N2, Ar, air) clearly indicate that the eta /p ratios do not scale as the partial pressure of electronegative gas in the mixture. Extensive calculations carried out using data experimentally obtained have shown that the attachment coefficient of the mixture eta mix can be expressed as eta mix= eta (1-exp- beta F/(100-F)) where eta is the attachment coefficient of the 100% electronegative gas, F is the percentage of the electronegative gas in the mixture and beta is a constant. The results of this analysis explain to a high degree of accuracy the data obtained in various mixtures and are in very good agreement with the data deduced by Itoh and co-workers (1980) using the Boltzmann equation method.