Abstract
We present in this paper the results of a theoretical study of electron impact broadening for several lines of the Ar VII ion. The results have been obtained using our quantum mechanical method and the semiclassical perturbation one. Results are presented for electron density 1018 cm−3 and for electron temperatures ranging from 2 × 10 4 to 5 × 10 5 K required for plasma modeling. Our results have been compared to other semiclassical ones obtained using different sources of atomic data. A study of the strong collisions contributions to line broadening has been performed. The atomic structure and collision data used for the calculations of line broadening are also calculated by our codes and compared to available theoretical results. The agreement found between the two calculations ensures that our line broadening procedure uses adequate structure and collision data.
Highlights
Atomic and line broadening data for many elements and their ions are very useful for solving many astrophysical problems, such as the calculations of opacity and radiative transfer [1]
We present in this paper the results of a theoretical study of electron impact broadening for several lines of the Ar VII ion
It has been shown that analysis of white dwarf atmospheres, where Stark broadening is dominant compared to the thermal Doppler broadening, needs models taking into account heavy element opacity
Summary
Atomic and line broadening data for many elements and their ions are very useful for solving many astrophysical problems, such as the calculations of opacity and radiative transfer [1]. The first applications were performed for the 2s3s−2s3p transitions in Be-like ions from nitrogen to neon [8] and for the 3s−3p transitions in Li-like ions from carbon to phosphor [9] This approach was used in Elabidi & Sahal-Bréchot [10] to check the dependence on the upper level ionization potential of electron impact widths and in Elabidi et al [11] to investigate the influence of strong collisions and quadrupolar potential contributions on line broadening. We used the sequence of the University College London (UCL) atomic codes SUPERSTRUCTURE/DW/JAJOM that have been used for many years to provide fine energy levels, wavelengths, radiative probability rates, and electron impact collision strengths They have been adapted to line broadening calculations [8]. We compare these results to the semiclassical ones [12], for which the atomic structure has been calculated with the Bates and Damgaard approximation [13]
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