Electron thermalization processes in the bicomponent systems of Kr and some simple molecular gases

The time evolution of electron mean energy (Te) in the bicomponent systems of Kr and some simple molecules: H2, D2, N2, CO, and CO2, at room temperature (Tg) has been observed by means of a pulse-radiolysis microwave-conductivity method. The excess electron temperature, Te–Tg, in a near thermal energy region decays exponentially with time. An observed decay lifetime is defined as an electron thermalization time. From the effect of the addition of a simple molecular gas to Kr on an electron thermalization time, the product (in unit of 1014 μs⋅cm−3) of a gas number density and a thermalization time for each pure additive molecule is obtained to be (3.3±1.2)×102 for H2, (3.4±1.2)×102 for D2, (2.3±0.3)×102 for N2, 8.9±3.0 for CO, and 2.5±0.3 for CO2, respectively.