Abstract
An extended comparison has been made between Boltzmann two-term and rigorous Monte Carlo calculations of time-dependent velocity distribution functions of electrons in a d.c. electric field in a gas to assess the limits of the conventional approximations. It is shown that under various conditions the two-term approximation is unable to represent the velocity distribution correctly even if the conventional quasi-stationary approximation of the velocity distribution anisotropy, usually adopted in this kind of calculations, is abandoned. The conditions which permit to use the two-term theory are discussed.
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