Systematic semi-classical calculations of Stark broadening parameters of NI, OI, NII, OII multiplets for modelling the radiative transfer in atmospheric air mixture plasmas

Abstract

Electron and ion Stark broadening parameters (widths and shifts) of NI, OI, NII, and OII for all the electric dipolar LS allowed transitions from the NIST data bases have been calculated following the semi-classical approach by Sahal–Bréchot (Astron. & Astrophys. 1 (1969) 91). The input data, positions and oscillator strengths of electric dipolar transitions, have been taken from the TOPBASE data bases (The Opacity Project, Vol. 1. Bristol and Philadelphia: Institute of Physics Publishing, 1995). When required, ion contributions have been estimated using the quasistatic approximation. The computational procedures have been validated by comparisons with available experimental and theoretical data. Discrepancies between measured line widths and our calculated ones are typically about 20%, while the magnitude order of the neutral line shifts is generally well predicted. Calculations have been carried out systematically for air mixture plasmas in the temperature range 6000– 25,000 K under the assumption of chemical equilibrium at atmospheric pressure.