Measurements of Lateral Diffusion Coefficients and First Townsend Coefficients for Electrons in Helium by an Electron-Density Sampling Method

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Abstract
Direct experimental measurements of electron diffusion coefficients D in helium have been carried out at 300°K in the range of 0<~EN<2.7×10−16 V cm2 (0<~EP0<10 V cm−1 Torr−1) by an improved electron-density sampling method. Absolute errors less than ± 0.5% are claimed in the range 0<~EN<9×10−17 V cm2 and less than 1.5% in the range 9×10−17<EN<2.7×10−16 V cm2.

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