Kinetics of Ionization-Recombination of a Plasma and Population Density of Excited Ions. I. Equilibrium Plasma

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It is shown that ions in a low-density plasma has an excited-state populationdensity described by corona equilibrium or by the capture-cascade scheme; forhydrogen-like ions both have the same 7-dependence ( p is the principal quantumnumber) of n( p)/ g( p)ccp -"' (77( p)/g( p) is the population density per unit statisticalweight) for an optically thin high-temperature plasma. For an equilibrium condi-tion, relative contribution is about 10: 1, verifying the corona model commonlyassumed. For a low-temperature equilibrium plasma, however, the capture-cascade component dominates over the corona one for high-lying levels. In thehigh-density limit partial LTE holds only if the plasma is in ionization equilibriumor in complete LTE. In view of the fact that the equilibrium plasma is a ratherexceptional case in actual situations, the theory is generalized : a plasma is de-composed into purely-ionizing- and purely-recombining-plasma components.
社団法人日本物理学会の論文
1979-07-15