J/ApJ/780/110 SIII collision strengths (Grieve+, 2014)
Electron-impact excitation collision strengths and theoretical line intensities
for transitions in SIII.
Grieve M.F.R., Ramsbottom C.A., Hudson C.E., Keenan F.P.
<Astrophys. J., 780, 110 (2014)>
=2014ApJ...780..110G 2014ApJ...780..110G
ADC_Keywords: Atomic physics
Keywords: atomic data - atomic processes - ultraviolet: planetary systems -
planets and satellites: individual (Io, Jupiter) - plasmas -
scattering
Abstract:
We present Maxwellian-averaged effective collision strengths for the
electron-impact excitation of SIII over a wide range of electron
temperatures of astrophysical importance, log Te(K)=3.0-6.0. The
calculation incorporates 53 fine-structure levels arising from the six
configurations--3s23p2, 3s3p3, 3s23p3d, 3s23p4s, 3s23p4p,
and 3s23p4d--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.
Description:
Collision strengths have been generated for 1378 transitions in SIII,
with a total of 53 fine-structure levels, arising from the 3s23p2,
3s3p3, 3s23p3d, 3s23p4s, 3s23p4p, and 3s23p4d configurations
included in the calculation.
In Table 2, the 53 fine-structure levels are listed, with each
assigned an index.
We present in Table 3 the complete set of effective collision
strengths for all 1378 transitions among the 53 fine-structure levels
considered in this work, at 16 temperatures ranging from log
Te=3.0-6.0.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 24 53 Index of the SIII fine-structure levels
table3.dat 149 1378 Effective collision strengths for SIII as a
function of temperature
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See also:
J/ApJ/526/544 : Collision strengths in S III (Tayal+, 1999)
J/A+AS/125/149 : CHIANTI-An Atomic Database For Emission Lines I. (Dere+ 1997)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- Index Level index
4- 24 A21 --- Level Level configuration
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- i [1/52] Lower level index (table 2)
4- 5 I2 --- j [2/53] Upper level index (table 2)
7- 14 E8.3 --- ECS1 [0/22.8] Effective collision strength at 1000K
16- 23 E8.3 --- ECS2 [0/23.5] Effective collision strength at 1580K
25- 32 E8.3 --- ECS3 [0/24.3] Effective collision strength at 2510K
34- 41 E8.3 --- ECS4 [0/24.9] Effective collision strength at 3980K
43- 50 E8.3 --- ECS5 [0/25.5] Effective collision strength at 6310K
52- 59 E8.3 --- ECS6 [0/26.2] Effective collision strength at 10000K
61- 68 E8.3 --- ECS7 [0/27.2] Effective collision strength at 15800K
70- 77 E8.3 --- ECS8 [0/28.8] Effective collision strength at 25100K
79- 86 E8.3 --- ECS9 [0/33] Effective collision strength at 39800K
88- 95 E8.3 --- ECS10 [0/44.3] Effective collision strength at 63100K
97-104 E8.3 --- ECS11 [0/61.6] Effective collision strength at 100000K
106-113 E8.3 --- ECS12 [0/87.1] Effective collision strength at 158000K
115-122 E8.3 --- ECS13 [0/123] Effective collision strength at 251000K
124-131 E8.3 --- ECS14 [0/173] Effective collision strength at 398000K
133-140 E8.3 --- ECS15 [0/236] Effective collision strength at 631000K
142-149 E8.3 --- ECS16 [0/303] Effective collision strength at 106K
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Sylvain Guehenneux [CDS] 29-Jan-2015