J/A+A/565/A77 Atomic data for FeIX (Del Zanna+, 2014)
Atomic data for astrophysics: Fe IX.
Del Zanna G., Storey P.J., Badnell N.R., Mason H.E.
<Astron. Astrophys. 565, A77 (2014)>
=2014A&A...565A..77D 2014A&A...565A..77D
ADC_Keywords: Atomic physics
Keywords: atomic data - line: identification - techniques: spectroscopic
Abstract:
We present the results of a new large-scale intermediate-coupling
frame transformation R-matrix scattering calculation for electron
collisional excitation of Fe IX. The target includes all the main
configurations up to n=5, to improve our earlier R-matrix and
distorted-wave (DW) calculations for the n=3,4 levels. Unlike similar
calculations which we carried out for the other coronal iron ions, in
this case the larger target does not significantly affect the
collision strengths of the strongest transitions to the n=3,4 levels.
Some differences are however present for a few transitions, in
particular for the 3d-4p line at 197.86Å. For the weaker
transitions, significant enhancements due to extra resonances
resulting from this much bigger target are found. Several new line
identifications are suggested. We find excellent agreement between
predicted and observed line intensities in the EUV (Hinode EIS)
showing that Fe IX lines provide a reliable temperature diagnostic. We
also show that the visible forbidden lines are a good diagnostic to
measure electron densities.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 51 865 Level energies of the RM4 calculation
table2.dat 117 373680 Transition probabilities and thermally averaged
collision strengths for the RM4 calculation
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See also:
J/A+A/541/A90 : Fe X soft X-ray lines (Del Zanna+, 2012)
J/A+A/543/A139 : Fe XII soft X-ray lines (Del Zanna+, 2012)
J/A+A/543/A144 : Fe XIII soft X-ray lines (Del Zanna+, 2012)
J/A+A/549/A42 : Fe XI soft X-ray lines (Del Zanna+, 2013)
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 [1/865] Level index
7- 24 A18 --- Level Electronic level description
25 A1 --- --- [(]
26 I1 --- 2S+1 [1/7] 2S+1 multiplicity
27 A1 --- --- [)]
28 I1 --- L [0-7] L value
29 A1 --- --- [(]
30- 33 F4.1 --- J [0/8] 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 [2/865] Upper level index of the transition
6- 8 I3 --- j [1/864] 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=1.62x104K
28- 35 E8.3 --- CS2 Averaged collision strength at T=4.05x104K
37- 44 E8.3 --- CS3 Averaged collision strength at T=8.1x104K
46- 53 E8.3 --- CS4 Averaged collision strength at T=1.62x105K
55- 62 E8.3 --- CS5 Averaged collision strength at T=4.05x105K
64- 71 E8.3 --- CS6 Averaged collision strength at T=8.1x105K
73- 80 E8.3 --- CS7 Averaged collision strength at T=1.62x106K
82- 89 E8.3 --- CS8 Averaged collision strength at T=4.05x106K
91- 98 E8.3 --- CS9 Averaged collision strength at T=8.1x106K
100-107 E8.3 --- CS10 Averaged collision strength at T=1.62x107K
109-117 E9.3 --- Elim High-energy limit
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Acknowledgements:
Giulio Del Zanna, gdelzanna(at)spd.aas.org
(End) Patricia Vannier [CDS] 25-Apr-2014