Author(s)

Ibrahima Sakho^*

Department of Experimental Sciences, UFR Sciences and Technologies, University of Thies, Thies, Senegal.

We report accurate wavelengths for the three most intense lines (resonance line: 1s^{2 1}S0 - 1s2p ¹P1, intercombination line: 1s^{2 1}S0 - 1s2p ³P1 and forbidden line: 1s^{2 1}S0 - 1s2s ³S1) along with wavelengths for the 1s^{2 1}S0 - 1snp¹P¹ and ¹S0 - 1snp³P2 (2 ≤ n ≤ 25) transitions in He-like systems (Z = 2 – 13). The first spectral lines that belong to the above transitions are established in the framework of the Screening Constant per Unit Nuclear Charge method. The results obtained agree excellently with various experimental and theoretical literature data. The uncertainties in wavelengths between the present calculations and the available literature data are less than 0.004Å. A host of new data listed in this paper may be of interest in astrophysical and laboratory plasmas diagnostic.

He-Like Systems, Semi-Empirical, Screening Constant Per Unit Nuclear Charge, Excited States, X-Ray Spectra

Sakho, I. (2020) Most Intense X-Ray Lines of the Helium Isoelectronic Sequence for Plasmas Diagnostic. Journal of Modern Physics, 11, 487-501. doi: 10.4236/jmp.2020.114031.