Abstract
The lateral and longitudinal diffusion coefficients for free electrons in weakly ionized gases (or in intrinsic semiconductors) under a steady-state and uniform electric field Eand with elastic collision frequency ν much larger than the inelastic one are obtained by the correlation function of the electron velocities. The mean free path method is used, since it allows expansions without divergences in the small number W2 / where Wis the electron drift velocity and the mean square value of the electron speed v. The obtained explicit expressions are particularly convenient when there are Ramsauer effects which can produce up to 40% errors in the results obtained by the usual Boltzmann—Legendre expansion. Moreover, the obtained expressions are immediately generalized so as to give noise spectral densities including the “convective noise” found by Gurevich, which corresponds to the difference between the generalized longitudinal and lateral diffusion coefficients.
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