S. Civiš, et al.
Infrared transitions and oscillator strengths of Ca and Mg⋆
A&A, 554, A24, 2013; doi: 10.1051/0004-6361/201321052


Aims. While solar spectra contain a lot of Ca I and Mg I infrared (IR) lines, no laboratory-measured spectra of these atoms have been reported for wavenumbers below 2000 cm-1. This study reports Ca I spectra in the 1300–4500 cm-1 range and Mg I spectra in the 1300–4500 cm-1 range. Methods. We performed a time-resolved Fourier transform infrared spectroscopy study of a plasma created by the laser ablation of MgF2 and CaF2 targets in a vacuum. The oscillator strengths (f-values) were calculated using quantum defect theory (QDT), which shows good agreement with the available experimental and theoretical results. Results. We report several Ca I and Mg I IR lines that have not been measured previously in laboratory. The recorded spectra allow the excitation energies of some Ca I and Mg I states with high orbital momentum (l = 4,5) to be determined. We also provide a long list of QDT-calculated f-values for Ca I and Mg I in the range of 800–9000 cm-1.


  author = "S. Civiš and M. Ferus and V. E. Chernov and E. M. Zanozina",
  title = "Infrared transitions and oscillator strengths of Ca and Mg⋆",
  year = 2013,
  journal = "A&A",
  volume = 554,
  pages = "A24",
  month = "May",
  doi = "10.1051/0004-6361/201321052",
  url = ""
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