ANOMALOUS ANISOTROPIC DIFFUSION OF ELECTRON SWARMS IN AC ELECTRIC-FIELDS

A time-dependent multi-term solution of the Boltzmann equation is used to calculate the drift and diffusion coefficients of electron swarms in gases under the influence of a time varying electric field. Two mod el gases are considered and for a.c. electric fields results are prese nted for a wide range of applied frequencies. Of particular interest i s the anomalous temporal behaviour of the longitudinal diffusion coeff icient, which is discussed here for the first time.