THE BEHAVIOUR OF POPULATION IN A PLASMA INTERACTING WITH AN ATOMIC GAS
Furukane,O., Oda,T.: 1984, Z.Naturforsch., 39a, 132.
The processes leading to the population inversion are investigated in a
recombining hydrogen plasma which is interacting with a cool and dense neutral
hydrogen by using the rate equations for electrons, ions and neutral particles.
The quasi-steady state (QSS) approximation is used only for the level i lying
above a certain level i* which is not the first excited level. The calculations
have shown that the quasi-steady state cannot be realized while intense energy
flows due to the collisional processes exist between different kinds of
particles such as the electrons and the ions in the plasma, and that the
population inversion is realized only in the quasi-steady state following the
transient phase. The effects of initial conditions of the hydrogen plasma and
of the introduced neutral hydrogen gas on the overpopulation density are also
discussed.
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