Time-of-flight measurement of electron drift velocity and longitudinal diffusion coefficient in nitrogen, carbon monoxide, carbon dioxide and hydrogen

The drift velocity and longitudinal diffusion coefficient have been obtained for electrons from measurements of the transit time of a pulsed electron swarm across a uniform electric field gap. Values have been obtained for electrons in nitrogen, carbon monoxide, carbon dioxide and hydrogen for high values of E/N (the ratio of electric field to gas number density) in the range 28 ¿¿ E/N ¿¿ 706 Td (1 Td = 10¿¿21 Vm2)