Abstract
A collisional-radiative equilibrium model was developed to investigate the population inversion on metal vaporaluminum plasma. The population inversion has been establishedbetween lower3s(3P1 °, 1P1°) and upper 3p(3P0, 1S°) levels. The vacuumultra-violet lasing on neon-like aluminum ions provideswavelengths of 111.9, 143.2, and 157.3 nm. The rate of relativedensity population, between lower 3s1P1° and upper 3p3P0 levels, reaches its highest valueof 7.16 at the electron density of 1019 cm-3. Themodified expression of the optical escape factor, in the case of the Doppler profile, was introduced in the calculation of the opacityeffect on the gain magnitudes. The Holstein expressionunderestimates the optical escape factor in the region ofrelatively small thickness. The resonance radiation trapping by the 3dconfiguration drastically alters the gain values. A gain greater than 1 cm-1 was found between lasing levels 3s 3P1 ° and3p3P0. The enhancement of gain was due to the pumping of heupper level by a dielectro...
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