Virtual Drift Velocity of Electrons

抄録

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.