J/ApJ/788/24 Collision strengths for transitions in Fe VII (Tayal+, 2014)
Electron impact excitation collision strengths for extreme ultraviolet lines
of Fe VII.
Tayal S.S., Zatsarinny O.
<Astrophys. J., 788, 24 (2014)>
=2014ApJ...788...24T 2014ApJ...788...24T (SIMBAD/NED BibCode)
ADC_Keywords: Atomic physics
Keywords: atomic data - atomic processes - line: formation
Abstract:
Extensive calculations have been performed for electron impact
excitation collision strengths and oscillator strengths for the Fe VII
extreme ultraviolet lines of astrophysical importance. The collision
strengths for fine-structure transitions are calculated in the
B-spline Breit-Pauli R-matrix approach. The target wavefunctions have
been calculated in the multiconfiguration Hartree-Fock method with
term-dependent non-orthogonal orbitals. The close-coupling expansion
includes 189 fine-structure levels of Fe VII belonging to terms of the
ground 3p6 3d2 and excited 3p5 3d3, 3p6 3d4l, 3p6 3d5s,
and 3p6 3d5p configurations. The effective collision strengths are
determined from the electron excitation collision strengths by
integration over a Maxwellian distribution of electron velocities. The
effective collision strengths are provided for 17766 fine-structure
transitions at electron temperatures from 104 to 107 K. Our
results normally agree with the previous R-matrix frame-transformation
calculations by Witthoeft & Badnell (2008A&A...481..543W 2008A&A...481..543W). However,
there are important differences for some transitions with the previous
calculations. The corrections to the previous results are mainly due
to more extensive expansions for the Fe VII target states.
Description:
We have performed a more elaborate calculation for the electron impact
excitation of Fe VII. The fine-structure effects have been included
in the close-coupling expansion in the Breit-Pauli approximation. We
used term-dependent non-orthogonal orbitals to describe the target
states accurately for the collision calculation. The wave functions
for different target states were optimized independently. We have
reported collision strengths and transition probabilities for all
transitions between LSJ levels of the ground 3p6 3d2 and first
excited 3p5 3d3, 3p6 3d4l, 3p6 3d5s, and 3p6 3d5p
configurations of Fe VII.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 79 189 Level Energies and Lifetimes for Fe VII
table3.dat 44 2715 Line Strengths, Oscillator Strengths, and
Transition Probabilities for E1 Transitions
in Fe VII
table5.dat 106 17766 Effective Collision Strengths for Transitions
in Fe VII
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 3 I3 --- Index Index
5- 14 A10 --- Conf Configuration
16- 22 A7 --- LSJ LS_J term
24- 28 F5.2 eV Exp ? NIST expected energy level
30- 34 F5.2 eV Present Present energy level
36- 40 F5.2 eV dP-Exp ? Difference between Present and expected
energy level
42- 46 F5.2 eV Z05 ? Zeng et al. (2005MNRAS.357..440Z 2005MNRAS.357..440Z) energy level
48- 52 F5.2 eV dZ-Wxp ? Difference between Z05 and expected
energy level
54- 58 F5.2 eV WB08 ? Witthoeft & Badnell (2008A&A...481..543W 2008A&A...481..543W)
energy level
60- 64 F5.2 eV dW-Exp ? Difference between WB08 and expected
energy level
66- 70 F5.2 eV D09 ? Del Zanna (2009A&A...508..501D 2009A&A...508..501D) energy level
72- 79 E8.3 s Lifetime ? Lifetime
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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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1- 3 I3 --- i [1/154] Lower level
5- 7 I3 --- k [14/189] Upper level
9- 17 F9.2 0.1nm Wave Wavelength; in Angstroms
19- 26 E8.2 --- S Line strength
28- 35 E8.2 --- fik Oscillator strength
37- 44 E8.2 s-1 Aki Transition probability
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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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1- 3 I3 --- i [1/188] Lower level
5- 7 I3 --- k [2/189] Upper level
9- 16 E8.2 --- CS0.5 Effective collision strength at 0.5x104 K
18- 25 E8.2 --- CS1.0 Effective collision strength at 1.0x104 K
27- 34 E8.2 --- CS2.5 Effective collision strength at 2.5x104 K
36- 43 E8.2 --- CS5.0 Effective collision strength at 5.0x104 K
45- 52 E8.2 --- CS10 Effective collision strength at 1.0x105 K
54- 61 E8.2 --- CS25 Effective collision strength at 2.5x105 K
63- 70 E8.2 --- CS50 Effective collision strength at 5.0x105 K
72- 79 E8.2 --- CS100 Effective collision strength at 1.0x106 K
81- 88 E8.2 --- CS250 Effective collision strength at 2.5x106 K
90- 97 E8.2 --- CS500 Effective collision strength at 5.0x106 K
99-106 E8.2 --- CS1000 Effective collision strength at 1.0x107 K
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History:
From electronic version of the journal
(End) Prepared by [AAS], Tiphaine Pouvreau [CDS] 03-Jul-2017