
TY  - JOUR
A1  - Skullerud, HR 
T1  - On the Theory of Electron Diffusion in Electrostatic Fields in Gases
JF  - Australian Journal of Physics
JO  - Aust. J.  Phys.
Y1  - 1974
VL  - 27
IS  - 2
SP  - 195
EP  - 210
KW  - 
UR  - https://doi.org/10.1071/PH740195 
N2  - The motion of electrons in a gas in the presence of large electron density gradients has been studied theoretically, starting from the two-term expansion of the Boltzmann equation. The effects of material boundaries have not been considered. An electron swarm released as a b-function in space and with an equilibrium energy distribution is found initially to develop as a spheroid with dimensions determined by the lateral diffusion coefficient. It subsequently passes through a stage involving a slowly decaying pear-shaped deformation, before ultimately becoming an ellipsoid with dimensions determined by the longitudinal and lateral components of the diffusion tensor. Numerical values cited in the literature for the long-term deviations from the mean square widths predicted by the diffusion equation have been found to be in error by factors of 10 or more. 
ER  -

