Abstract
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 2s2 2p2, 2s2 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 Ar18+, Ti22+, and Fe26+ ions are the most promising laser emission lines in the XUV and soft X-ray spectral regions.
Highlights
The last three decades enormous advances in our understanding and developing high-efficiency of X-ray laser with gain [1] [2] by using the mechanism for demonstrating X-ray lasing in resonant photo pumping have been seen
The possibility of laser emission from plasma of Ar XIII, Ti XVII and Fe XXI ions via electron collisional pumping, in the XUV spectral region was investigated at different plasma temperatures and electron densities
Equation (7) has been used to calculate the gain coefficient (α) for Doppler broadening of the various transitions in the Ar XIII, Ti XVII and Fe XXI ion
Summary
The last three decades enormous advances in our understanding and developing high-efficiency of X-ray laser with gain [1] [2] by using the mechanism for demonstrating X-ray lasing in resonant photo pumping have been seen. The modeling of astrophysical and laboratory plasmas used c-like ions and their emission lines Those data for transition mostly lie in the soft X-ray and EUV regions [4]. Spontaneous decay rates and oscillator strengths have been calculated by Aggrawal et al [5] [6], Feldman et al [7] & Aggrawal et al [8] for transitions in Ar XIII, Ti XVII & Fe XXI. (2016) Theoretical Study of Laser Emission for C-Like (Ar XIII), (Ti XVII) and (Fe XXI). We predict the reduced population and gain coefficient for C-like Ar XIII, Ti XVII & Fe XXI by a steady state equation in the collisional radiative model after achieving a population inversion between the allowed transition states
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