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Virtual Drift Velocity of Electrons

A new definition of virtual drift velocity of non-conservative electron swarm in configuration space W r ' is proposed using flight time integral (FTI) expression in pulsed Townsend (PT). Its appropriateness is shown with the agreement of ionization coefficient defined in PT α P = ν iP / W r ' and the Townsend's first ionization coefficient defined in steady state Townsend (SST) α S . An exact drift velocity measurement of non-conservative electron swarm in configuration space will give W r ', and the analysis using the drift velocity data will give correct collision cross sections when the definition of W r ' is used. In addition, the features of the energy distributions and transport coefficients in three observation modes, time of flight (TOF), PT and SST under non-conservative condition are discussed in this paper in relation with the energy conservation in respective modes.