J/A+A/585/A118 Electron collisional excitation of NiXII (Del Zanna+, 2016)
Atomic data for astrophysics: Ni XII.
Del Zanna G., Badnell N.R.
<Astron. Astrophys. 585, A118 (2016)>
=2016A&A...585A.118D 2016A&A...585A.118D (SIMBAD/NED BibCode)
ADC_Keywords: Atomic physics
Keywords: atomic data - techniques: spectroscopic - Sun: corona -
line: identification -
Abstract:
We present new large-scale R-matrix (up to n=4) scattering
calculations for the electron collisional excitation of Cl-like
NiXII.
We used the intermediate-coupling frame transformation method.
We compare predicted and observed line intensities using laboratory
and solar spectra, finding good agreement for all the main soft X-ray
lines. With the exception of the three strongest transitions, large
discrepancies with previous estimates are found, especially for the
decays from the lowest 3s2 3p4 3d levels.
This includes the forbidden UV lines. The atomic data for the n = 4
levels are the first to be calculated. We revise previous experimental
energies, and suggest several new identifications.
We point out the uncertainty in the wavelength of the 3s2 3p5 2P1/2
3s2 3p4 3d 2D3/2 transition, which is important for density
diagnostics.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 51 589 Level energies of the RM4 calculation
table2.dat 117 173166 Transition probabilities and thermally averaged
collision strengths for the RM4 calculation
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See also:
J/A+A/365/268 : IRON Project. XLVII. Ni III (Bautista, 2001)
J/A+A/460/959 : Ni XIX radiative and excitation rates (Aggarwal+, 2006)
J/A+A/475/393 : Ni XI radiative and excitation rates (Aggarwal+, 2007)
J/A+A/488/365 : Ni XIX effective collision strengths (Aggarwal+, 2008)
J/A+A/488/1155 : Ni XXV energy levels and radiative rates (Duan+, 2008)
J/A+A/513/A55 : Effective collision strengths of Ni II (Cassidy+, 2010)
J/A+A/537/A12 : Effective collision strength of Ni XVII (Hudson+, 2012)
J/ApJ/738/5 : Effective collision strengths in NiII (Cassidy+, 2011)
J/A+A/566/A123 : Ni XI electron collisional excitation (Del Zanna+, 2014)
J/A+A/567/A18 : Ni XV electron collisional excitation (Del Zanna+, 2014)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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3- 5 I3 --- Index Level index
7- 24 A18 --- Level Level description
25 A1 --- --- [(]
26 I1 --- 2S+1 [2/6] 2S+1 multiplicity
27 A1 --- --- [)]
28 I1 --- L [0/6] L value
29 A1 --- --- [(]
30- 33 F4.1 --- J [0/7] J value
34 A1 --- --- [)]
43- 51 F9.1 cm-1 E Target energy (ab initio)
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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2- 4 I3 --- i [2/589] Upper level index of the transition
6- 8 I3 --- j [1/588] Lower level index of the transition
10- 17 E8.3 s-1 A Einstein A coefficient
19- 26 E8.3 --- CS1 Averaged collision strength at T=2.88x104K
28- 35 E8.3 --- CS2 Averaged collision strength at T=7.20x104K
37- 44 E8.3 --- CS3 Averaged collision strength at T=1.44x105K
46- 53 E8.3 --- CS4 Averaged collision strength at T=2.88x105K
55- 62 E8.3 --- CS5 Averaged collision strength at T=7.20x105K
64- 71 E8.3 --- CS6 Averaged collision strength at T=1.44x106K
73- 80 E8.3 --- CS7 Averaged collision strength at T=2.88x106K
82- 89 E8.3 --- CS8 Averaged collision strength at T=7.20x106K
91- 98 E8.3 --- CS9 Averaged collision strength at T=1.44x107K
100-107 E8.3 --- CS10 Averaged collision strength at T=2.88x107K
109-117 E9.2 --- Elim High-energy limit
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Acknowledgements:
Giulio Del Zanna, g.del-zanna(at)damtp.cam.ac.uk
(End) Patricia Vannier [CDS] 16-Nov-2015