In the capture-radiative-cascade (CRC) phase, which is in the lower-
ne region than Griem’s boundary, excited levels have population inversion
n(
p)⁄
g(
p)∝
p1.5 (
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
nzne or
nzne2 (
nz is the ion density) to reach the boundary. The saturation phase in the higher-
ne 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.
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