Abstract
Experimental values have been given for both the drift velocity and the ratio of longitudinal diffusion coefficient to mobility for electrons in helium (1.4<or=E/N<or=226 Td) and neon (1.4<or=E/N<or approximately=339 Td). Comparison has been made with a Monte Carlo computer simulation and a good fit has been obtained with the present and previously measured data. The simulation results for ionisation coefficient and ratio of radial diffusion coefficient to mobility have been compared with both experimental and other theoretical values over a wide range of E/N. A comparison between the mean swarm energy and the breakdown voltage has clearly shown that equilibrium conditions exist at the highest E/N (2260 Td for helium and 5600 Td for neon) for which the computations were carried out.
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