Most Intense X-Ray Lines of the Helium Isoelectronic Sequence for Plasmas Diagnostic
- 1 Department of Experimental Sciences, UFR Sciences and Technologies, University of Thies, Thies, Senegal
Abstract
We report accurate wavelengths for the three most intense lines (resonance line: 1s 2 1 S0 - 1s2p 1 P1, intercombination line: 1s 2 1 S0 - 1s2p 3 P1 and forbidden line: 1s 2 1 S0 - 1s2s 3 S1) along with wavelengths for the 1s 2 1 S0 - 1s n p 1 P 1 and 1 S0 - 1s n p 3 P2 (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 0.004 Å . A host of new data listed in this paper may be of interest in astrophysical and laboratory plasmas diagnostic.
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