J/A+A/566/A123 NiXI electron collisional excitation (Del Zanna+, 2014)
Atomic data for astrophysics: Ni XI.
Del Zanna G., Storey P.J., Badnell, N.R.
<Astron. Astrophys. 566, A123 (2014)>
=2014A&A...566A.123D 2014A&A...566A.123D
ADC_Keywords: Atomic physics
Keywords: atomic data - line: identification - Sun: corona -
techniques: spectroscopic
Abstract:
We present a new large-scale R-matrix scattering calculation for
electron collisional excitation of Ni XI, carried out with the
intermediate-coupling frame transformation method (ICFT). The target
includes all the main configurations up to n=4, and is a significant
improvement over earlier R-matrix (only three n=3 configurations) and
distorted-wave (DW) calculations. We find significant enhancements in
the collision strengths of many of the strong transitions to the n=3,4
levels. They are due to the resonances that arise within the present
large-scale target.
This results in significant increases in the predicted intensities of
the UV and visible forbidden lines within the 3s2 3p5 3d
configuration, the strong EUV lines that result from the decays of the
3s2 3p5 3d levels to the ground state, and the decays from the n=4
levels, which are visible in the soft X-rays. We find good agreement
between predicted and observed line intensities in the EUV. With the
present atomic data, lines from Ni XI can reliably be used for plasma
diagnostics. We also revise some level energies and suggest a few new
possible identifications.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 51 599 Level energies of the RM4 calculation
table2.dat 117 179101 Transition probabilities and thermally averaged
collision strengths for the RM4 calculation
--------------------------------------------------------------------------------
See also:
J/A+AS/119/99 : [NiI] + [NiII] transition probabilities (Quinet+, 1996)
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 : NiXI radiative and excitation rates (Aggarwal+, 2007)
J/A+A/488/365 : NiXIX 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/A+A/541/A90 : FeX soft X-ray lines (Del Zanna+, 2012)
J/A+A/543/A139 : FeXII soft X-ray lines (Del Zanna+, 2012)
J/A+A/543/A144 : FeXIII soft X-ray lines (Del Zanna+, 2012)
J/A+A/549/A42 : FeXI soft X-ray lines (Del Zanna+, 2013)
J/A+A/565/A77 : Atomic data for FeIX (Del Zanna+, 2014)
Byte-by-byte Description of file: table1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
3- 5 I3 --- Index [1/599] Level index
7- 24 A18 --- Level Level description
25 A1 --- --- [(]
26 I1 --- 2S+1 [1/7] Spin 2S+1 multiplicity
27 A1 --- --- [)]
28 A1 --- L [0-7] L value
29 A1 --- --- [(]
30- 33 F4.1 --- J [0/8] J value
34 A1 --- --- [)]
41- 51 F11.1 cm-1 E [0/1.81e+6] Target energy (ab initio)
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
2- 4 I3 --- i [2/599] Upper level index of the transition
6- 8 I3 --- j [1/598] 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=2.42x104K
28- 35 E8.3 --- CS2 Averaged collision strength at T=6.05x104K
37- 44 E8.3 --- CS3 Averaged collision strength at T=1.21x105K
46- 53 E8.3 --- CS4 Averaged collision strength at T=2.42x105K
55- 62 E8.3 --- CS5 Averaged collision strength at T=6.05x105K
64- 71 E8.3 --- CS6 Averaged collision strength at T=1.21x106K
73- 80 E8.3 --- CS7 Averaged collision strength at T=2.42x106K
82- 89 E8.3 --- CS8 Averaged collision strength at T=6.05x106K
91- 98 E8.3 --- CS9 Averaged collision strength at T=1.21x107K
100-107 E8.3 --- CS10 Averaged collision strength at T=2.42x107K
109-117 E9.3 --- Elim High-energy limit
--------------------------------------------------------------------------------
Acknowledgements:
Giulio Del Zanna, gdelzanna(at)spd.aas.org
(End) Patricia Vannier [CDS] 20-May-2014