Variations in electron transport in argon with temperature near the Ramsauer-Townsend minimum

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Abstract
A previously developed three-term expansion method has been extended to study the electron swarm in argon in the energy range of the Ramsauer-Townsend minimum. The swarm parameters of electrons have been computed at temperatures of 89.6, 293 and 1000K in the range 1*10-212)-17. In particular, the dependence of the drift velocity on gas temperature in the vicinity of the minimum is discussed in detail, and it is shown that a 'crossing curve' property appears. Also the validity of the conventional two-term approximation is confirmed by direct comparison with the lth-order distribution function (l=0, 1, 2) in the region of the minimum.