The drift velocity of secondary electrons in electron‐beam irradiated Ar/HCl gas mixtures was obtained by measuring both the current and electron densities as a function of an externally applied electric field. The measurements were performed for a variety of HCl concentrations between 0.1 and 5.0 and electric‐field strengths between 0.1 and 10 Td (1 Td=10−17V cm2). The electron‐beam pulse was 350 ns long, at an energy of 150 keV and current density between 4.2 and 0.017 A/cm2. The electron density was measured by time‐resolved infrared interferometry at 9.6 mgr;m. The results show that the Ar/HCl system exhibits negative differential conductivity.
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