Stark-broadening calculations of singly ionized carbon spectral lines

Abstract

Using the semiclassical perturbation approach in the impact approximation, we have obtained Stark-broadening parameters for 148 C II multiplets. Energy levels and oscillator strengths are taken from the TOPbase data base. Results are obtained as a function of temperature for a set of perturber densities of 10

Stark broadening of B iv spectral lines

“…Lanz et al (1988); Popović et al (1999a); Popović et al (1999b); Popović et al (2001a,b); Tankosić, Popović & Dimitrijević (2003); Simić et al (2005a,b)). In white dwarfs, especially Stark broadening is the dominant collisional line broadening mechanism in all important layers of the atmosphere (Popović et al 1999b;Tankosić, Popović & Dimitrijević 2003;Milovanović et al 2004;Simić et al 2006;Dimitrijević et al 2011;Dufour et al 2011;Larbi-Terzi et al 2012;Simić, Dimitrijević & Sahal-Bréchot 2013;Simić, Dimitrijević & Popović 2014). The theory of Stark broadening is well applied, especially for accurate spectroscopic diagnostics and modelling.…”

“…In astrophysics, Stark broadening data for various atomic and ionic lines (since we do not know a priori the chemical composition of a star) are of particular interest especially for white dwarfs, where this line broadening mechanism is usually the principal one (Popović et al 1999b;Tankosić, Popović & Dimitrijević 2003;Milovanović et al 2004;Simić et al 2006;Hamdi et al 2008;Dimitrijević et al 2011;Dufour et al 2011;Larbi-Terzi et al 2012;Simić, Dimitrijević & Sahal-Bréchot 2013;Simić, Dimitrijević & Popović 2014). This broadening mechanism may be of interest and for the main sequence stars, especialy for A type and late B type (Lanz et al 1988;Popović et al 1999a;Popović et al 1999b;Popović et al 2001a,b;Dimitrijević et al 2003a,b;Tankosić, Popović & Dimitrijević 2003;Dimitrijević et al 2004;Milovanović et al 2004;Dimitrijević et al 2005;Simić et al 2005a,b;Simić, Dimitrijević & Kovačević 2009;Simić, Dimitrijević & Sahal-Bréchot 2013;Simić, Dimitrijević & Popović 2014).…”

Widths and Shifts of Isolated Lines of Neutral and Ionized Atoms Perturbed by Collisions With Electrons and Ions: An Outline of the Semiclassical Perturbation (SCP) Method and of the Approximations Used for the Calculations

“…This has been made in all our papers that are cited in the STARK-B database. As examples, we will only cite here [9,[35][36][37][38][39]. In spite of the fact that the strong collision contribution is never very small (see Tables 3-5), the accuracy is about 20%-30% for the widths of simpler spectra, but is worse for very complex spectra, particularly when configuration mixing is present in the description of energy levels, but not always [39].…”

“…The difference between the use of the different atomic data codes does not exceed 30%, except in exceptional cases, such as in [38], for instance (see below).…”

“…Then TOPbase has often been used since the 1990s [43], when the needed sets of energy levels and oscillator strengths became available: see, e.g., [35] and further papers, e.g., [38]. The TOPbase atomic data have been obtained within the close-coupling scattering theory by means of the R-matrix method with innovative asymptotic techniques.…”