J/A+A/592/A135 SiXIII and SXV collision strengths (Fernandez-Menchero+, 2016)
Scaling of collision strengths for highly-excited states of ions of the H- and
He-like sequences.
Fernandez-Menchero L., Del Zanna G., Badnell N.R.
<Astron. Astrophys. 592, A135 (2016)>
=2016A&A...592A.135F 2016A&A...592A.135F (SIMBAD/NED BibCode)
ADC_Keywords: Atomic physics
Keywords: atomic data - Sun: corona - techniques: spectroscopic
Abstract:
Emission lines from highly-excited states (n≥5) of H- and He-like
ions have been detected in astrophysical sources and fusion plasmas.
For such excited states, R-matrix or distorted wave calculations for
electron-impact excitation are very limited, due to the large size of
the atomic basis set needed to describe them. Calculations for n≥6
are also not generally available. We study the behaviour of the
electron-impact excitation collision strengths and effective collision
strengths for the most important transitions used to model electron
collision dominated astrophysical plasmas, solar, for example. We
investigate the dependence on the relevant parameters: the principal
quantum number n or the nuclear charge Z. We also estimate the
importance of coupling to highly-excited states and the continuum by
comparing the results of different sized calculations. We provide
analytic formulae to calculate the electron-impact excitation
collision strengths and effective collision strengths to
highly-excited states (n≥8) of H- and He-like ions. These
extrapolated effective collision strengths can be used to interpret
astrophysical and fusion plasma via collisional-radiative modelling.
Description:
In present online material we provide in CDS format the extrapolated
values of energies, radiative parameters (gf), and electron-impact
excitation effective collision strengths (Upsilon) obtained with the
extrapolation rules described in the manuscript for the two test ions:
He-like Si XIII and S XV.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
si13_t1.dat 58 79 Level energies for ion Si XIII, calculated and
extrapolated
si13_t2.dat 125 1206 Electron-impact effective collision strengths
(Upsilon) for the ion Si XIII calculated
(W2005a) and extrapolated
si13_t3.dat 17 2790 Radiative data (gf) for the ion Si XIII
calculated and extrapolated
s15_t1.dat 58 79 Level energies for ion S XV, calculated and
extrapolated
s15_t2.dat 125 1206 Electron-impact effective collision strengths
(Upsilon) for the ion S XV calculated (W2005b)
and extrapolated
s15_t3.dat 17 2806 Radiative data (gf) for the ion S XV
calculated and extrapolated
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Byte-by-byte Description of file: s15_t1.dat si13_t1.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- I Level index
5- 14 A10 --- CF Configuration (largest weight)
16- 17 I2 --- S (2S+1) term spin designation (largest weight)
20 A1 --- L L term designation (largest weight)
22- 24 F3.1 --- J Level total angular momentum
30- 41 F12.1 cm-1 Eobs Term energy, observed NIST (1)
47- 58 F12.1 cm-1 Eteo Term energy, calculated and extrapolated
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Note (1): NIST energy from
MZ1983 (W. C. Martin and R. Zalubas, J. Phys. Chem. Ref. Data 12, 323-380
(1983) DOI:10.1063/1.555685) for Si XIII,
MZM1990 (W. C. Martin, R. Zalubas, and A. Musgrove, J. Phys. Chem. Ref. Data
19, 821-880 (1990) DOI:10.1063/1.555862) for S XV.
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Byte-by-byte Description of file (#): si13_t2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
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1- 4 I4 --- I1 Lower level index (as in si13_t1 table)
5- 8 I4 --- I2 Upper level index (as in si13_t1 table)
10- 17 E8.3 --- Ups1 Electron-impact effective collision strengths
for Te=3.38+04K calculated (W2005a)
and extrapolated (1)
19- 26 E8.3 --- Ups2 Electron-impact effective collision strengths
for Te=8.45+04K calculated (W2005a)
and extrapolated (1)
28- 35 E8.3 --- Ups3 Electron-impact effective collision strengths
for Te=1.69+05K calculated (W2005a)
and extrapolated (1)
37- 44 E8.3 --- Ups4 Electron-impact effective collision strengths
for Te=3.38+05K calculated (W2005a)
and extrapolated (1)
46- 53 E8.3 --- Ups5 Electron-impact effective collision strengths
for Te=8.45+05K calculated (W2005a)
and extrapolated (1)
55- 62 E8.3 --- Ups6 Electron-impact effective collision strengths
for Te=1.69+06K calculated (W2005a)
and extrapolated (1)
64- 71 E8.3 --- Ups7 Electron-impact effective collision strengths
for Te=3.38+06K calculated (W2005a)
and extrapolated (1)
73- 80 E8.3 --- Ups8 Electron-impact effective collision strengths
for Te=8.45+06K calculated (W2005a)
and extrapolated (1)
82- 89 E8.3 --- Ups9 Electron-impact effective collision strengths
for Te=1.69+07K calculated (W2005a)
and extrapolated (1)
91- 98 E8.3 --- Ups10 Electron-impact effective collision strengths
for Te=3.38+07K calculated (W2005a)
and extrapolated (1)
100-107 E8.3 --- Ups11 Electron-impact effective collision strengths
for Te=8.45+07K calculated (W2005a)
and extrapolated (1)
109-116 E8.3 --- Ups12 Electron-impact effective collision strengths
for Te=1.69+08K calculated (W2005a)
and extrapolated (1)
118-125 E8.3 --- Ups13 Electron-impact effective collision strengths
for Te=3.38+08K calculated (W2005a)
and extrapolated (1)
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Note (1): W2005a: A. W. Whiteford OPEN-ADAS
URL: http://open.adas.ac.uk/detail/adf04/copaw[he/helike_adw05][si12.dat]
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Byte-by-byte Description of file (#): s15_t2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 4 I4 --- I1 Lower level index (as in s15_t1 table)
5- 8 I4 --- I2 Upper level index (as in s15_t1 table)
10- 17 E8.3 --- Ups1 Electron-impact effective collision strengths
for Te=4.50+04K calculated (W2005b)
and extrapolated (1)
19- 26 E8.3 --- Ups2 Electron-impact effective collision strengths
for Te=1.12+05K calculated (W2005b)
and extrapolated (1)
28- 35 E8.3 --- Ups3 Electron-impact effective collision strengths
for Te=2.25+05K calculated (W2005b)
and extrapolated (1)
37- 44 E8.3 --- Ups4 Electron-impact effective collision strengths
for Te=4.50+05K calculated (W2005b)
and extrapolated (1)
46- 53 E8.3 --- Ups5 Electron-impact effective collision strengths
for Te=1.12+06K calculated (W2005b)
and extrapolated (1)
55- 62 E8.3 --- Ups6 Electron-impact effective collision strengths
for Te=2.25+06K calculated (W2005b)
and extrapolated (1)
64- 71 E8.3 --- Ups7 Electron-impact effective collision strengths
for Te=4.50+06K calculated (W2005b)
and extrapolated (1)
73- 80 E8.3 --- Ups8 Electron-impact effective collision strengths
for Te=1.12+07K calculated (W2005b)
and extrapolated (1)
82- 89 E8.3 --- Ups9 Electron-impact effective collision strengths
for Te=2.25+07 calculated (W2005b)
and extrapolated (1)
91- 98 E8.3 --- Ups10 Electron-impact effective collision strengths
for Te=4.50+07K calculated (W2005b)
and extrapolated (1)
100-107 E8.3 --- Ups11 Electron-impact effective collision strengths
for Te=1.12+08K calculated (W2005b)
and extrapolated (1)
109-116 E8.3 --- Ups12 Electron-impact effective collision strengths
for Te=2.25+08K calculated (W2005b)
and extrapolated (1)
118-125 E8.3 --- Ups13 Electron-impact effective collision strengths
for Te=4.50+08K calculated (W2005b)
and extrapolated (1)
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Note (1): W2005b: A. W. Whiteford OPEN-ADAS
URL: http://open.adas.ac.uk/detail/adf04/copaw[he/helike_adw05][s14.dat]
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Byte-by-byte Description of file: s15_t3.dat si13_t3.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- I1 Lower level index (as in s15_t1 or si13_t1 tables)
5- 8 I4 --- I2 Upper level index (as in s15_t1 or si13_t1 tables)
9- 17 E9.2 s-1 A Einstein A coefficient for dipole transitions
calculated and extrapolated (1)
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Note (1): calculates from
W2005a (W2005a A. W. Whiteford OPEN-ADAS
URL: http://open.adas.ac.uk/detail/adf04/copaw[he/helike_adw05][si12.dat])
for Si XIII,
W2005b (W2005b A. W. Whiteford OPEN-ADAS
URL: http://open.adas.ac.uk/detail/adf04/copaw[he/helike_adw05][s14.dat])
for S XV.
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Acknowledgements:
Luis Fernandez-Menchero, luis.fernandez-menchero(at)drake.edu
(End) L. Fernandez-Menchero [Drake University], P. Vannier [CDS] 11-Jul-2016