Stark parameter regularities of neutral helium lines within different spectral series

Abstract

Stark width experimental and theoretical data of neutral helium spectral lines have been used to demonstrate their dependence on the upper-level ionization potential within different spectral series. The emphasis is on the term describing structure influence on the studied Stark-width dependences. After establishing these dependences, predictions were made for electron, proton and ionized helium impact contributions to the Stark widths of neutral helium spectral lines that have not been measured experimentally or calculated theoretically until now (transitions from high levels of He I). The accuracy of the data obtained is comparable with the accuracies of the experimental and theoretical values used in establishing the dependences.

New perspectives in the analysis of Stark width regularities and systematic trends

“…Comparing the great amount of Stark width data from STARK-B database (Sahal-Bréchot et al, 2014b, Purić offered so-called "generalized" estimate (Purić, Šćepanović, 1999) which should be used, according to the authors, "to calculate Stark line widths of the multiply charged ion of different elements along the periodic table." These scientific articles evolve over time, so Purić and co-workers later give up searching for a universal formula for all lines and focus their statistical analysis only on individual homologous or isoelectronic series (Dojčinović et al, 2011(Dojčinović et al, , 2012(Dojčinović et al, , 2013aTapalaga et al, 2011Tapalaga et al, , 2018Jevtić et al, 2012;Trklja et al, 2019b,a). However, the possibility to apply all of these estimates to predict new unknown Stark widths should be furtherly discussed (Majlinger et al, 2017a(Majlinger et al, ,b, 2020b.…”

Stark Widths Regularities Within: ns-np, np-ns, np-nd, nd-np and nd-nf Spectral Series of Potassium Isoelectronic Sequence

“…Influence of electron density and temperature on Stark broadening of spectral lines, within spectral series of potassium isoelectronic sequence, have been studied before Equation (1) has been applied in regularity analyzing procedure. Regularity approach used in present paper has been successfully applied previous articles of our group [8][9][10][11][12][13][14][15], where other emitters were analyzed.…”

Division B Commission 14 Working Group: Collision Processes

“…A semi-empirical approach, that uses Hartree-Fock relativistic wave functions and includes core polarization effects, has been applied to 237 Mg III (Colón et al 2013) Regularities and systematic trends of Stark broadening parameters within various spectral series have been investigated for spectral lines of helium (Dojčinović et al 2012), lithium (Dojčinović et al 2013b), beryllium (Dojčinović et al 2011), calcium Tapalaga et al 2012, potassium (Jevtić et al 2012), and within homologous spectral series of alkaline earth metals (Dojčinović et al 2013a). The systematic trends obtained and data on regular behaviour within spectral series, can be of interest for the spectroscopic diagnostic of astrophysical plasmas, since this enables the estimation and prediction of missing Stark broadening parameters.…”