Abstract
Paper [2] gave the solution of an algebraic system of equations for the populations of the lower discrete levels and free electron density, using the so-called nconstant runoff" assumption [3], i. e., that the populations N n of the excited states and free electron density N e do not change in time during the recombination process. However, when the free electrons are cooled rapidly the solution of the constant-runoff equations may prove unsuitable for describing the true relaxation picture even in an optically thick plasma. Making allowance for the reabsorption of resonance radiation, which varies strongly in the course of recombination or ionization, involves the analysis of the non-steady-state problem, associated with the solution of the system of nonlinear differential relaxation equations.
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