Kinetics of Ionization-Recombination of a Plasma and Population Density of Excited Ions. IV. Recombining Plasma–Low-Temperature Case

This is the authors' abstract. We don't add key points for this paper.

In the capture-radiative-cascade (CRC) phase, which is in the lower- n e region than Griem's boundary, excited levels have population inversion n ( p )/ g ( p )∝ p 1.5 ( n ( p )/ g ( p ) is the population density of an excited level with the principal quantum number p per unit statistical weight), and n ( p ) increases in proportion to n z n e or n z n 2 e ( n z is the ion density) to reach the boundary. The saturation phase in the higher- n e region is further divided by Byron's boundary into the high- and low-lying levels. For the former levels partial LTE holds, whereas the latter levels are in the recombination-ladder-like de-excitation flow resulting in n ( p )/ g ( p )∝ p -6 . For the collisional-radiative recombination the high-density limit is established when Griem's boundary level reaches Byron's boundary level. Summary is given of the ionizing and recombining plasmas.