ELECTRON-IMPACT EXCITATION COLLISION STRENGTHS AND THEORETICAL LINE INTENSITIES FOR TRANSITIONS IN S III

We present Maxwellian-averaged effective collision strengths for the electron-impact excitation of S III over a wide range of electron temperatures of astrophysical importance, log T sub(e)(K) = 3.0-6.0. The calculation incorporates 53 fine-structure levels arising from the six configurations-3s sup...

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Bibliographic Details
Published in:The Astrophysical journal 2014-01, Vol.780 (1), p.1-9
Main Authors: Grieve, M F R, Ramsbottom, C A, Hudson, C E, Keenan, F P
Format: Article
Language:English
Subjects:
ASTROPHYSICS
ASTROPHYSICS, COSMOLOGY AND ASTRONOMY
COLLISIONS
COMPARATIVE EVALUATIONS
CONFIGURATION
DATA
ELECTRON DENSITY
ELECTRON TEMPERATURE
ELECTRONS
EMISSION
Emission spectroscopy
EXCITATION
EXTREME ULTRAVIOLET RADIATION
FAR ULTRAVIOLET RADIATION
FINE STRUCTURE
Mathematical models
PLANETS
PLASMA
R MATRIX
SATELLITES
SCATTERING
SIMULATION
SPECTRA
Spectral lines
Spectroscopy
Strength
Ultraviolet
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Summary:We present Maxwellian-averaged effective collision strengths for the electron-impact excitation of S III over a wide range of electron temperatures of astrophysical importance, log T sub(e)(K) = 3.0-6.0. The calculation incorporates 53 fine-structure levels arising from the six configurations-3s super(2)3p super(2), 3s3p super(3), 3s super(2)3p3 d, 3s super(2)3p4 s, 3s super(2)3p4 p, and 3s super(2)3p4 d-giving rise to 1378 individual lines and is undertaken using the recently developed RMATRX II plus FINE95 suite of codes. A detailed comparison is made with a previous R-matrix calculation and significant differences are found for some transitions. The atomic data are subsequently incorporated into the modeling code cloudy to generate line intensities for a range of plasma parameters, with emphasis on allowed ultraviolet extreme-ultraviolet emission lines detected from the Io plasma torus. Electron density-sensitive line ratios are calculated with the present atomic data and compared with those from CHIANTI v7.1, as well as with Io plasma torus spectra obtained by Far-Ultraviolet Spectroscopic Explorer and Extreme-Ultraviolet Explorer. The present line intensities are found to agree well with the observational results and provide a noticeable improvement on the values predicted by CHIANTI.
ISSN:0004-637X
1538-4357
DOI:10.1088/0004-637X/780/1/110