Gain coefficient calculation for short wave laser emission from nickel-like Sm

Abstract

The energy levels, transition probabilities and effective collision strengths for the 1s22s22p63s23p63d10 and the 1s22s22p63s23p63d94l (l=s, p, d and f) states of nickel-like Sm are used in the calculation of the reduced population of 55 fine structure levels over a wide range of electron density values (from 1020 to 4×1022) and at various electron plasma temperatures. For those transitions with positive population inversion factor, the gain coefficients are evaluated and plotted against the electron density.

XUV and Soft X-Ray Laser Radiation from Ni-Like Au

“…This result is in agreement with that of Feldman et al [14,15,19]. See also the data for nickel-like Sm , W, and Eu [20][21][22].At high electron densities ( ), the radiative decay to all the levels will be negligible compared to collisional depopulations and all the level populations become independent of the electron density (see Figures 1-3). The (3d 3/2 4d 3/2 ) 0 level has higher population density from electron density 10 21 to 10 22 cm −3 than the other levels at electron temperature 0.5 KeV, from electron density 10 21 to 2 × 10 22 cm −3 at electron temperature 1 KeV, and from electron density 10 21 to 4 × 10 22 cm −3 at electron temperature 1.5 KeV which mean that the population inversion occur in these ranges.…”

Reduced population and gain coefficient calculations for soft X-ray laser emission from Eu35+

“…[19,20,26]. See also our data for nickel-like Sm and W [27,28]. At high population densities (N e 410 23 ), radiative decay to all levels will be negligible compared to collisional depopulations and all level populations become independent of electron density and are approximately equal.…”

Search for Laser Lines in Sodium like Fe Plasmas

“…We expect that at high densities (N e > 10 20 cm -3 ), radiative decay to all levels will be negligible compared to collisional depopulations and all level population become independent of electron density and are approximately the same (see ref. [16][17][18]). The population inversion is largest when electron collisional de-excitation rate for the upper level is comparable to the radiative decay of this level [10].…”