Quantum Stark broadening data for the C IV, N V, O VI, F VII and Ne VIII resonance doublets

Haykel Elabidi (1) , Sylvie Sahal-Bréchot (2, 3) , Milan S. Dimitrijevic (2, 3, 4) , Nebil Ben Nessib (1)

1 Groupe de Recherche en Physique Atomique et Astrophysique, Université de Carthage
2 LERMA - Laboratoire d'Etude du Rayonnement et de la Matière en Astrophysique
3 Dynamique des milieux interstellaires et plasmas stellaires
4 Belgrade Astronomical Observatory

In this paper, we present new Stark electron impact widths of the 2s-2p resonance doublets of the C IV, N V, O VI, F VII and Ne VIII ions, obtained using our quantum mechanical method. The present results are required to develop future spectral analysis using non-local thermodynamic equilibrium model atmospheres, which can make the determination of photospheric properties more accurate. Results are presented for a large range of electron temperatures required for plasma modelling. These are compared to the available theoretical ones. They are also used to check the previously obtained semiclassical perturbation results, and very good agreement is found. The atomic structure and collision data, used for the calculations of line broadening for the five ions studied here, are also calculated and compared to available theoretical results. The agreement found between the two calculations ensures that our line-broadening procedure uses the adequate structure and collision data. Scalings of linewidths with effective charge Z are also studied.

Domaines: Astrophysique [astro-ph]; Planète et Univers [physics]

Haykel Elabidi, Sylvie Sahal-Bréchot, Milan S. Dimitrijevic, Nebil Ben Nessib. Quantum Stark broadening data for the C IV, N V, O VI, F VII and Ne VIII resonance doublets. Monthly Notices of the Royal Astronomical Society, 2011, 417, pp.2624-2630. ⟨10.1111/j.1365-2966.2011.19434.x⟩. ⟨hal-03785755⟩