Energy levels, transition probability and oscillator strengths have been calculated for the Ar XIII, Ti XVII and Fe XXI. The configurations included in the calculations are 2s 2 2p 2 , 2s 2 2p 3l (l = s, p & d) and 4l (l = s, p, d, & f) of C-like Ar XIII, Ti XVII & Fe XXI which has 69 fine structures by using the fully relativistic flexible atomic code (FAC) program. These data are used in the determination of the reduced population and gain coefficients over a wide range of electron densities from (10 +18 to 10 +23) and at various plasmas temperatures. The results show that the transitions in Ar 18+ , Ti 22+ , and Fe 26+ ions are the most promising laser emission lines in the XUV and soft X-ray spectral regions.
The energy states, transitions chances, oscillator intensities, and collision intensities were computed with FAC (fully relativistic flexible atomic code) program. The calculated results were utilized for identification of the reduced population to sixty-nine thin structural states in C-like Zn (XXV) and indicates the gain coefficients with several electron densities (from 10 +20 to 10 +22 cm 3 ) and at a wide range of electron plasma temperatures (
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