VUV lasing on puff metal vapor of neon-like aluminum ions produced by Z-pinch plasma

A collisional-radiative equilibrium model was developed to investigate the population inversion on metal vapor aluminum plasma. The population inversion has been established between lower 3s(3P1(omicron)Pi°) and upper 3p(3P0,1So) levels. The vacuum ultra-violet lasing on neon-like aluminum ions provides wavelengths of 111.9, 143.2, and 157.3 nm. The rate of relative density population, between lower 3s1P1 ° and upper 3p3P0 levels, reaches its highest value of 7.16 at the electron density of 10^-19 cm ^-3. The modified expression of the optical escape factor, in the case of the Doppler profile, was introduced in the calculation of the opacity effect on the gain magnitudes. The Holstein expression underestimates the optical escape factor in the region of relatively small thickness. The resonance radiation trapping by the 3d configuration drastically alters the gain values. A gain greater than 1 cm ^-1 was found between lasing levels 3s 3P1° and 3p3P0. The enhancement of gain was due to the pumping of the upper level by a dielectronic recombination process from the ground state of fluorine-like and by the inner-shell ionization process from excited levels of sodium-like ions.