Time-resolved conductivity measurements on nanosecond pulse-ionized xenon gas confirm the prediction of McMahon and Shizgal that initially formed hot electrons can undergo a net displacement in the reverse field direction. This negative mobility situation persists for 30 ns after the pulse at 10 atm (E/N{}10^-19 V cm²) and gradually disappears as the field strength is increased.
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Warman et al. (1985) studied this question.
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