Porter, R.L. (2006) Theory and Application of Helium and Helium-Like Ions in Astrophysical Environments. College of Art and Sciences, Lexington University of Kentucky, Lexington.

has been cited by the following article:

• TITLE: Most Intense X-Ray Lines of the Helium Isoelectronic Sequence for Plasmas Diagnostic

  AUTHORS: Ibrahima Sakho

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

  JOURNAL NAME: Journal of Modern Physics, Vol.11 No.4, March 26, 2020

  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.