Electron diffusion in hydrogen at high electric fields and low gas pressures

e radial distribution of a stream of electrons after drifting through a gas in a uniform electric field has been theoretically analysed. The solution takes into account electron ionization and the boundary conditions imposed by the electrodes. The distribution has been experimentally verified for hydrogen, and values of the ratio of the diffusion coefficient to the mobility coefficient have been obtained for 15 < E/p 0 < 100 V cm -1 torr -1 .