Accurate atomic data is considered to be the principal way to effectively solve the future energy problem as a clean and infinite energy resource and it is being developed internationally via the International Thermonuclear Experimental Reactor $(ITER)$ Project . Then, extensive spectroscopic studies both experimental and theoretical have been performed in the last few years in order to estimate the power loss from the impurities in the forthcoming fusion reactors. Furthermore, accurate values of wavelengths and their errors are required for the interpretation of a wealth of high-resolution data obtained in the last two decades by the Chandra X-ray Observatory and the European Space Agency's X-ray Multi-Mirror Mission.
As previously published [2, 3], we continue to focus on helium-like ions. In this work, energy levels, wavelengths and transitions rates have been calculated for the lowest singly excited 70 levels among $ 1snl (n\leq 6, l \leq (n-1)) $ configurations and the lowest doubly excited 250 levels arising from the K-vacancy $2ln'l' (n'\leq 6,\:l' \leq (n'-1))$ configurations of helium-like ions with $Z = 5-9$ namely $B\: IV$, $C \:V$, $N \:VI$, $O \:VII$ and $F \:VIII$ . The calculations were performed using the Relativistic Configuration Interaction $(RCI)$ method implemented in the Flexible Atomic Code $(FAC)$ . Comparisons were made with other available theories reported in the literature [6, 7, 8, 9]. Finally, the accuracy of the present calculations is enough to facilitate the identification of many observed spectral lines, plasma modelling as well as diagnostics of astrophysical plasma and controlled thermonuclear fusion.
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 S Manai, D E Salhi, S Ben Nasr and H Jelassi. Results in Physics. 37, 105487 (2022).
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|Presenter name||Manai, Soumaya|
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