J/A+A/543/A139 Fe XII soft X-ray lines (Del Zanna+, 2012)
Atomic data for astrophysics: Fe XII soft X-ray lines.
Del Zanna G., Storey P.J., Badnell N.R., Mason H.E.
<Astron. Astrophys. 543, A139 (2012)>
=2012A&A...543A.139D 2012A&A...543A.139D
ADC_Keywords: Atomic physics
Keywords: atomic data - Sun: corona - techniques: spectroscopic
Abstract:
We present new large-scale R-matrix (up to n=4) and distorted-wave
(DW, up to n=6) scattering calculations for electron collisional
excitation of Fe XII. The first aim is to provide accurate atomic data
for the soft X-rays, where strong decays from the n=4 levels are
present. As found in previous work on Fe X, resonances attached to n=4
levels increase the cross-sections for excitations from the ground
state to some n=4 levels, when compared to DW calculations.
Cascading from higher levels is also important.
We provide a number of models and line intensities, and list a number of
strong unidentified lines.
The second aim is to assess the effects of the large R-matrix
calculation on the n=3 transitions. Compared to our previous (n=3)
R-matrix calculation, we find overall excellent agreement to within a
few percent, however a few key density diagnostic EUV intensities
differ by about 60% at coronal densities. The new atomic data result
in lower electron densities, resolving previous discrepancies with
solar observations.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 51 912 Level energies of the RM4 calculation
table2.dat 189 415416 Transition probabilities and thermally averaged
collision strengths for the RM4 calculation
table3.dat 51 5143 Level energies of the DW6 calculation
table4.dat 189 209890 Thermally averaged collision strengths for the
DW6 calculation
table5.dat 32 2285660 Transition probabilities for the DW6
calculation (full dataset)
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See also:
J/A+A/541/A90 : Fe X soft X-ray lines (Del Zanna+, 2012)
J/A+A/543/A144 : Fe XIII soft X-ray lines (Del Zanna+, 2012)
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 [1/912] Level index
7- 24 A18 --- Level Level description
25 A1 --- --- [(]
26 I1 --- 2S+1 2S+1 multiplicity
27 A1 --- --- [)]
28 I1 --- L [0/6] L value
29 A1 --- --- [(]
30- 33 F4.1 --- J [0.5/7.5] 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 [1/912] Upper level index of the transition
6- 8 I3 --- j [1/912] Lower level index of the transition
10- 17 E8.2 s-1 A Einstein A coefficient
19- 26 E8.2 --- CS1 Averaged collision strength at T=1.0x104K
28- 35 E8.2 --- CS2 Averaged collision strength at T=2.51x104K
37- 44 E8.2 --- CS3 Averaged collision strength at T=5.01x104K
46- 53 E8.2 --- CS4 Averaged collision strength at T=1x105K
55- 62 E8.2 --- CS5 Averaged collision strength at T=2x105K
64- 71 E8.2 --- CS6 Averaged collision strength at T=3.16x105K
73- 80 E8.2 --- CS7 Averaged collision strength at T=5.01x105K
82- 89 E8.2 --- CS8 Averaged collision strength at T=7.94x105K
91- 98 E8.2 --- CS9 Averaged collision strength at T=1x106K
100-107 E8.2 --- CS10 Averaged collision strength at T=1.26x106K
109-116 E8.2 --- CS11 Averaged collision strength at T=2x106K
118-125 E8.2 --- CS12 Averaged collision strength at T=3.16x106K
127-134 E8.2 --- CS13 Averaged collision strength at T=5.01x106K
136-143 E8.2 --- CS14 Averaged collision strength at T=7.94x106K
145-152 E8.2 --- CS15 Averaged collision strength at T=1.26x107K
154-161 E8.2 --- CS16 Averaged collision strength at T=2x107K
163-170 E8.2 --- CS17 Averaged collision strength at T=3.98x107K
172-179 E8.2 --- CS18 Averaged collision strength at T=1x108K
181-189 E9.2 Ry Elim High-energy limit
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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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2- 5 I4 --- Index [1/5143] Level index
7- 24 A18 --- Level Level description
25 A1 --- --- [(]
26 I1 --- 2S+1 [2/6] 2S+1 multiplicity
27 A1 --- --- [)]
28 A1 --- L [SPDFGHIK] L value
29 A1 --- --- [(]
30- 33 F4.1 --- J [0.5/7.5] 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: table4.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- i [1/5143] Upper level index of the transition
6- 8 I3 --- j [1/41] Lower level index of the transition
10- 17 E8.2 s-1 A Einstein A coefficient
19- 26 E8.2 --- CS1 Averaged collision strength at T=1.0x104K
28- 35 E8.2 --- CS2 Averaged collision strength at T=2.51x104K
37- 44 E8.2 --- CS3 Averaged collision strength at T=5.01x104K
46- 53 E8.2 --- CS4 Averaged collision strength at T=1x105K
55- 62 E8.2 --- CS5 Averaged collision strength at T=2x105K
64- 71 E8.2 --- CS6 Averaged collision strength at T=3.16x105K
73- 80 E8.2 --- CS7 Averaged collision strength at T=5.01x105K
82- 89 E8.2 --- CS8 Averaged collision strength at T=7.94x105K
91- 98 E8.2 --- CS9 Averaged collision strength at T=1x106K
100-107 E8.2 --- CS10 Averaged collision strength at T=1.26x106K
109-116 E8.2 --- CS11 Averaged collision strength at T=2x106K
118-125 E8.2 --- CS12 Averaged collision strength at T=3.16x106K
127-134 E8.2 --- CS13 Averaged collision strength at T=5.01x106K
136-143 E8.2 --- CS14 Averaged collision strength at T=7.94x106K
145-152 E8.2 --- CS15 Averaged collision strength at T=1.26x107K
154-161 E8.2 --- CS16 Averaged collision strength at T=2x107K
163-170 E8.2 --- CS17 Averaged collision strength at T=3.98x107K
172-179 E8.2 --- CS18 Averaged collision strength at T=1x108K
181-189 E9.2 Ry Elim High-energy limit
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Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
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3- 5 I3 --- i [0/999] Lower level index of the transition
7- 10 I4 --- j [1/5143] Upper level index of the transition
13- 21 E9.4 [-] loggf Oscillator strength (gf value)
24- 32 E9.4 s-1 A Einstein A coefficient
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Acknowledgements:
Giulio Del Zanna, gdelzanna(at)spd.aas.org
(End) Patricia Vannier [CDS] 10-Jul-2012