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Journal Articles Monthly Notices of the Royal Astronomical Society Year : 2024

Stark broadening data for ultraviolet lines of Ni v


We provide in this work Stark broadening data (widths and shifts) for 120 ultraviolet spectral lines of Ni V ion. Our calculations are performed using the semiclassical perturbation method. For energy levels and oscillator strength calculations, we use the multiconfiguration Hatree–Fock approach. Stark shifts and widths are calculated for collisions with electrons and with the positive ions: H + , He + , and He ++ , allowing us to take into account the important perturbers in stellar atmospheres. We compare our Stark widths with estimations obtained using the Cowley formula. Our electron impact Stark widths are also fitted with temperature using a logarithmic formula. Finally, our obtained Stark widths are used to investigate the influence of Stark broadening in the atmospheric conditions of hot DA white dwarfs. Despite the importance of ultraviolet lines of Ni V ion for modelling white dwarf atmospheres and also for investigations of variation of fundamental constants with gravitational potential, we did not find Stark broadening data previously calculated or measured for Ni V ion. The objective of this work is to give the missed data.
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Dates and versions

hal-04593970 , version 1 (30-05-2024)




Rafik Hamdi, Sylvie Sahal-Bréchot, Milan S Dimitrijević, Haykel Elabidi. Stark broadening data for ultraviolet lines of Ni v. Monthly Notices of the Royal Astronomical Society, 2024, 528, pp.6347 - 6353. ⟨10.1093/mnras/stae391⟩. ⟨hal-04593970⟩
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