Energy levels, electric dipole transition probabilities and oscillator strengths in five times ionized silicon have been calculated in intermediate co

Stark-broadening parameters have been calculated for 114 spectral lines of triply charged lead ion (Pb iv) using semiclassical perturbation approach in the impact approximation. The provided widths and shifts have been obtained for a set of temperatures from 20 000 to 300 000 K and an electron density of 10¹⁷ cm⁻³. The studied lines correspond to transitions between the configurations 5d¹⁰nl-5d¹⁰n′l′ and 5d⁹6s²-5d¹⁰nl. Energy levels and oscillator strengths needed for this calculation have been calculated using a Hartree–Fock relativistic (HFR) approach. Comparison has also been made with available theoretical and experimental results. In addition, the regularity in the 5d¹⁰6s ²S_1/2-5d¹⁰np²P^o_1/2 spectral series has been studied.

Stark broadening parameters are of interest for many problems in astrophysics and laboratory plasmas investigation. Ar II spectral lines are observed in many kinds of stellar atmospheres such as the atmospheres of B-Type stars and subdwarf B stars. In this work, we present theoretical Stark widths for Ar II spectral lines. We use the impact semiclassical perturbation approach. Our results are compared with the available experimental values. Finally, the importance of the Stark broadening mechanism is studied in atmospheric conditions of subdwarf B stars.

Using a semiclassical approach, we have calculated ab initio electron-, proton-, and ionized helium-impact line widths and shift for 26 Ne V multiplets. Energy levels and oscillator strengths have been calculated using SUPERSTRUCTURE code. Results have been presented for an electron density of 1017 cm-3 as a function of temperature, and are compared with experimental and other theoretical results.