Time evolutions of electron mean energy in a He–Kr bicomponent system and a Ne pure system are observed by means of a pulse-radiolysis microwave-conductivity method, assuming that an electron energy distribution function is always Maxwellian in the energy range from about 100 meV to thermal. Excess electron temperature Te–Tg decays exponentially, whose decay time is defined as a thermalization time. Products of gas pressure and thermalization time are estimated to be 9.7 Torr μs for He, 1.0×103 Torr μs for Ne, and 1.7×102 Torr μs for Kr. The present result for Kr obtained from the He–Kr bicomponent system is in good agreement with that obtained from the Kr pure system.
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Suzuki et al. (1986) studied this question.