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Some rare gases such as Ar, Kr and Xe have a Ramsauer minimum in their momentum transfer cross sections. It has been known that the electron energy distribution (EED) in these gases at a low electric field shows occasionally a double peak structure. This paper presents the results of the calculation by Monte Carlo Simulation (MCS) on the mechanism of the double peak structure of EED in Ar. The calculations are performed at 100 Torr in gas pressure and 10 cm in gap length between plane parallel electrodes. The double peak structure of the EED is observed in the region of electron mean energy corresponding to the Ramsauer minimum. Because the electron escaped from the momentum transfer collision by the Ramsauer -Townsnd effect, the EED hardly reach the equilibrium with the repeated flight of electron around the Ramsauer minimum. The electron mean energy is not constant spatially in the region. It is concluded that the double peak structure of EED is only observed as a transient process which tends to the stationary EED depending only on E/N.

Double Peak Structure of Electron Energy Distribution in Ramsauer Gases by Monte Carlo Simulation