On the S III and S IV spectral lines Stark broadening parameters

Abstract

Stark widths of three S III spectral lines belonging to 4p–5p transitions have been measured and calculated. Measurements have been performed in a low pressure linear pulsed arc at 2.1 × 1023 m−3 electron density and 40 000 K electron temperature. Calculations for S III lines were performed by using the modified semiempirical approach. For S IV 4s 2S–4p 2Po multiplet, calculations were performed within the semiclassical perturbation formalism. The obtained results were compared with other theoretical and experimental data.

Experimental Stark widths and shifts of triply ionized sulfur spectral lines

“…The aim of this paper is to present, for the first time, the measured Stark shift (d) values of two prominent S IV spectral lines belonging to the 4s 2 S-4p 2 P 0 transition with committant Stark FWHM (full-width at half intensity maximum, W ) values at 33 600 K electron temperature (T ) and 2.8 × 10 23 m −3 electron density (N ). Our measured W and d data have been compared to the available theoretical predictions based on various approximations presented by Dimitrijević & Konjević (1981), Hey & Breger (1980) and Dimitrijević et al (1996). Besides, on the basis of the measured relative line intensity ratio we have obtained the ratio of the spontaneous emission probabilities (A) which agree well with existing theoretical predictions (NIST 2002).…”

“…Hey & Breger (1980) calculated W values using semiclassical impact approximation only at the T value obtained in the experiment presented by Platiša et al (1979). SCPF denotes the results of the semiclassical perturbation formalism presented by Dimitrijević et al (1996) using approximations explained in Sahal-Bréchot (1969a,b). On the basis of Table 1 and Fig.…”

“…SCPF, calculations by the use of the semiclassical perturbation formalism (Dimitrijević et al 1996). SE, MSE, G and GM denotes theoretical W values (see text).…”

“…However, only one paper deals with measurements of the Stark widths of two (309.727 nm and 311.761 nm) triply ionized sulfur spectral lines (Platiša et al 1979). Their calculated Stark width values were presented in three papers (Dimitrijević & Konjević 1981;Hey &Breger 1980 andDimitrijević et al 1996). No experimental Stark shift investigations exist up to now, and only one work (Dimitrijević et al 1996) deals with the theoretical calculations of the S IV Stark shifts, to the knowledge of the authors (Lesage & Fuhr 1999).…”

“…Their calculated Stark width values were presented in three papers (Dimitrijević & Konjević 1981;Hey &Breger 1980 andDimitrijević et al 1996). No experimental Stark shift investigations exist up to now, and only one work (Dimitrijević et al 1996) deals with the theoretical calculations of the S IV Stark shifts, to the knowledge of the authors (Lesage & Fuhr 1999). The aim of this paper is to present, for the first time, the measured Stark shift (d) values of two prominent S IV spectral lines belonging to the 4s 2 S-4p 2 P 0 transition with committant Stark FWHM (full-width at half intensity maximum, W ) values at 33 600 K electron temperature (T ) and 2.8 × 10 23 m −3 electron density (N ).…”