The following movies illustrate the motion of electrons in a homogeneous electric field
as obtained from a Monte Carlo simulation.
Conditions: V = 500 V, p = 41.4 Pa, E/n = 500 Td
Evolution of an electron avalanche - to see the movie click on the image (requires QuickTime player):
A swarm resulting from the emission of 100 electrons from the cathode - to see the movie click on the image (requires QuickTime player).
Note the simultaneous (i) multiplication, (ii) drift, and (iii) diffusion.
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Z. Donko, MTA-SZFKI (2010)