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Open AccessArticle

Electron Impact Excitation of S III: An Assessment

Astrophysics Research Centre, School of Mathematics and Physics, Queen’s University Belfast, Belfast BT7 1NN, Northern Ireland, UK
Atoms 2019, 7(3), 78; https://doi.org/10.3390/atoms7030078
Received: 11 July 2019 / Revised: 14 August 2019 / Accepted: 15 August 2019 / Published: 17 August 2019
(This article belongs to the Section Atomic, Molecular and Nuclear Spectroscopy and Collisions)
In a recent paper, Tayal et al. (Astrophys. J. Suppl. 2019, 242, 9) reported results for energy levels, radiative rates (A-values), and effective collision strengths ( Υ ) for transitions among the 198 levels of Si-like S III. For the calculations, they adopted the multi-configuration Hartree–Fock (MCHF) code for the energy levels and A-values and the B-spline R-matrix (BSR) code for Υ . Their reported results appear to be accurate for energy levels and A-values, but not for Υ . Through our independent calculations by adopting the flexible atomic code (FAC), we demonstrate that their reported results for Υ are underestimated, by up to a factor of two, and at all temperatures, particularly for the allowed transitions, but some forbidden ones as well. Additionally, for transitions involving the higher levels, the behaviour of their Υ results is not correct. View Full-Text
Keywords: electon impact excitation of Si-like S III; collision strengths; effective collision strengths; accuracy assessments electon impact excitation of Si-like S III; collision strengths; effective collision strengths; accuracy assessments
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Aggarwal, K.M. Electron Impact Excitation of S III: An Assessment. Atoms 2019, 7, 78.

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