Abstract
Values of Townsend's energy factor kl for electrons in dry, carbon dioxide free air have been determined as a function of the parameter E Ip for 0 . 2 < E Ip < 40 at a temperature of 293�K. The results are first compared with those of other workers and are then utilized in a recomparison of the cross sections for electron attachment deduced from swarm and beam-type experiments.

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