Infrared transitions and oscillator strengths of Ca and Mg⋆
1 J. Heyrovský Institute of Physical
Chemistry, Academy of Sciences of the Czech Republic, Dolejškova 3, 18223
Prague 8, Czech
2 Voronezh State University, 394693 Voronezh, Russia
3 State Research Center of Russian Federation Troitsk Institute of Innovation and Fusion Research, 142190 Troitsk, Moscow Region, Russia
Received: 7 January 2013
Accepted: 24 March 2013
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.
Key words: atomic data / methods: laboratory / techniques: spectroscopic
Tables 5 and 6 are only available at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (126.96.36.199) or via http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/554/A24
© ESO, 2013