Abstract
The electron swarm behaviors in model gases with elastic momentum transfer cross-section of the form q ( e )∝ e r ( r =-1/2, 0, 1/2 and 1) are analyzed by the time-of-flight method of a Boltzmann equation. The velocity distribution functions are apprroximated by three term expansion. Here e is the electron energy. The ratios D L / D T are calculated to study an anisotropy in real space. Here D L and D T are the longitudinal and the transverse diffusion coefficients to an electric field E . The values of electron-to-atom mass ratios m / M are changed from 10 -4 to 5×10 -2 and the values of E / N are taken as 2.8, 14 and 28 Td respectively. Here N is the gas number density. The present result shows that the anisotropy in real space depends upon m / M regardless of E / N . The discrepancy between the electron diffusion coefficient D V as defined in velocity space and D T , and the validity of the usual two-term method to calculate the time-of-flight parameters are discussed in detail.
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