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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 (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). 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:
FileName Lrecl Records Explanations
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
Byte-by-byte Description of file: table2.dat
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) 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) 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) energy level 72- 79 E8.3 s Lifetime ? Lifetime
Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
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
Byte-by-byte Description of file: table5.dat
Bytes Format Units Label Explanations
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
History: From electronic version of the journal
(End) Prepared by [AAS], Tiphaine Pouvreau [CDS] 03-Jul-2017
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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