Abstract
Ionization equilibrium in low-density low-temperature plasma is considered. It is demonstrated using hydrogen and cesium as examples that the Saha equation predicts an almost jump-like change in the electron density on isochors in a narrow temperature range. Thus, in contrast to a smooth rise in the degree of ionization with increasing temperature at high plasma densities, an increase in the temperature in low-density plasma should result in a sharp transition from a neutral state to a fully ionized plasma. This transition is accompanied by a jump-like increase in the electric conductivity. The relation of these effects to the recombination transition in the model of the early Universe is discussed. The possibility of observing such a transition experimentally and the problems concerning the time of plasma relaxation into an equilibrium state at long free path lengths of plasma particles are considered.
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Original Russian Text © S.A. Triger, A.L. Khomkin, A.S. Shumikhin, 2011, published in Fizika Plazmy, 2011, Vol. 37, No. 9, pp. 873–880.
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Triger, S.A., Khomkin, A.L. & Shumikhin, A.S. Ionization transition in low-density plasma. Plasma Phys. Rep. 37, 816–822 (2011). https://doi.org/10.1134/S1063780X11080095
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DOI: https://doi.org/10.1134/S1063780X11080095