Abstract
We report accurate wavelengths for the three most intense lines (resonance line: 1s2 1S0 - 1s2p 1P1, intercombination line: 1s2 1S0 - 1s2p 3P1 and forbidden line: 1s2 1S0 - 1s2s 3S1) along with wavelengths for the 1s2 1S0 - 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.
Highlights
The helium-like isoelectronic series emit strong X-ray wavelengths
We report accurate wavelengths for the three most intense lines along with wavelengths for the 1s2 1S0 - 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
Summary
The most intense lines of these systems are the resonance line designated by ω ( labelled r: 1s2 1S0 - 1s2p1P1), the intercombination lines (x + y) (or i: 1s2 1S0 1s2p3P2, 1) and the forbidden line z (or f: 1s2 1S0 - 1s2s 3S1). These three lines correspond to the transitions between the n = 2 excited shell and the n = 1 ground state shell. These line ratios enable to determine the prevailed ioni-
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