Semi-Classical Calculations of Stark Broadening Impact Theory of Singly-Ionized Carbon, Nitrogen and Oxygen Spectral Lines

Abstract

Using the semi-classical perturbation approach by Sahal-Bréchot (1969 Astron. Astrophys. 1, 91, 2 322; 1974 Astron. Astrophys. 35 321; 1991 Astron. Astrophys. 245 322) updated by Dimitrjević and Sahal-Bréchot (1984 J. Quant. Spectrosc. Radiat. Transf. 31 301; 1995 Physica Scripta 52 41) and by Ben Nessib et al. (1996 Physica Scripta 54 608) we have calculated Stark broadening widths of several C II, N II and O II spectral lines and input TOPbase (Opacity Project) sophisticated atomic structure data into the Sahal-Bréchot’s computer code. Then we have compared our results with those of available experiments and with Griem’s (1974) simplified semi-classical data. We show that our theoretical results, the simplified semi-classical calculations and experimental values are in good agreement. We also give new values of Stark broadening widths for several transitions of singly-ionized nitrogen and oxygen.

Modified semiempirical electron width calculations of singly-ionized oxygen spectral lines

“…This is well within the error bars of the semiempirical and the modified semiempirical methods estimated to be ±50% (Griem 1974;Dimitrijević & Konjević 1980) which is a very good agreement especially taking into account that the needed atomic data set is much smaller than for more sophisticated semi-classical calculations (Sahal-Bréchot 1969a,b;Griem 1974;Mahmoudi et al 2004 2 D where the discrepancy between experiment and theoretical calculations is of the order of 50% which is also within the error bars of the semi-classical and the modified semiempirical method.…”

“…(5) by up to 30%, but the agreement with experiments indicates that this is equilibrated by the underestimation of the contribution of elastic collisions. Table 2 present a comparison of our calculations (W MSE ) with theoretical results of Dimitrijević (1982) (W D ) obtained using the semi-classical approach of Griem (1974) and theoretical data (W MBS ) calculated by Mahmoudi et al (2004) using the semi-classical method of Sahal-Bréchot (1969a,b).…”

“…The obtained Stark FWHM values at various electron temperatures and electron densities and comparisons with other experimental and theoretical data are shown in Tables 1 and 2. With W m are denoted the measured widths, W MBS is the electronimpact width calculated by Mahmoudi et al (2004) on the basis of the semi-classical approach of Sahal-Bréchot (1969a,b), W MSE present calculations with the modified semiempirical approach of Dimitrijević and Konjević (1980) (corresponding to Eqs. (6)- (10)), and W eG the semi-classical approach by Griem (1974).…”

“…Theoretical Stark width dependence on electron temperature for an electron density of 1 × 10 17 cm −3 . , Djeniže et al (1998); the solid line denotes results of Dimitrijević (1982) obtained by the semi-classical theory of Griem (1974); the dashed line denotes data calculated by Mahmoudi et al (2004) and the doted line denotes our calculation with the modified semiempirical formalism (Dimitrijević & Konjević 1980). λ m is the average wavelength for the multiplet.…”

“…theoretical calculations (Mahmoudi et al 2004;Griem 1974) for all considered experimental conditions (T and N e ). Indeed the ratio…”