J/ApJ/743/206 Effective collision strengths of FeVIII (Tayal+, 2011)
Effective collision strengths for electron-impact excitation of Fe VIII.
Tayal S.S., Zatsarinny O.
<Astrophys. J., 743, 206 (2011)>
=2011ApJ...743..206T 2011ApJ...743..206T
ADC_Keywords: Atomic physics
Keywords: atomic data - atomic processes
Abstract:
New extensive calculations are reported for electron collision
strengths, rate coefficients, and transition probabilities for the
astrophysically important lines of FeVIII. The collision strengths
have been calculated in the close-coupling approximation using the
B-spline Breit-Pauli R-matrix method (BSR) code (Zatsarinny
2006CoPhC.174..273Z 2006CoPhC.174..273Z). The multiconfiguration Hartree-Fock method with
term-dependent non-orthogonal orbitals is employed for an accurate
representation of the target wave functions. The close-coupling
expansion includes 102 fine-structure levels of FeVIII covering all
possible terms of the ground 3p63d and singly excited 3p53d2,
3p64l, 3p53d4s, 3s3p63d2, and 3p65l configurations. The
present calculations are more extensive than the previous ones,
leading to a total 5151 transitions between fine-structure levels. The
effective collision strengths are obtained by averaging the electron
collision strengths over a Maxwellian distribution of velocities and
these are tabulated for all fine-structure transitions at electron
temperatures in the range from 5x103 to 5x106K. There is an
overall good agreement with the previous 77-state calculations by
Griffin, Pindzola, & Badnell (2000A&AS..142..317G 2000A&AS..142..317G), but significant
differences are also noted for some transitions.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 93 102 Level energies (eV) and lifetimes (s) for FeVIII
table3.dat 42 1131 Line strengths, oscillator strengths, and
transition probabilities for E1 transitions in FeVIII
table5.dat 97 5151 Effective collision strengths for transitions
in FeVIII
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See also:
J/A+A/537/A22 : Atomic data for X-ray lines of FeVIII and FeIX (O'Dwyer+, 2012)
J/ApJS/188/32 : Breit-Pauli transition probabilities for SII (Tayal+, 2010)
J/A+A/457/721 : IRON Project. LXII. Fe XVIII transitions (Nahar, 2006)
J/A+A/385/716 : N-like and O-like Breit-Pauli energy levels (Tachiev+, 2002)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- Index [1/102] Index number
5- 20 A16 --- Conf Configuration
22- 31 A10 --- LSJ LSJ level
33- 38 F6.2 eV Eexp ? Experimental excitation energy based mainly on
Ramonas & Ryabtsev (1980OptSp..48..348R 1980OptSp..48..348R) unless
flagged
39 A1 --- r_Eexp [cd] Reference flag on Eexp (1)
41- 46 F6.2 eV Target Adjusted energy
48- 53 F6.2 eV Prsnt ab initio energy ("Present")
55- 59 F5.2 eV Diff1 ? Difference between "Eexp" and "Prsnt"
61- 66 F6.2 eV G00 ? Energy from Griffin et al. (2000A&AS..142..317G 2000A&AS..142..317G)
68- 72 F5.2 eV Diff2 ? Difference between "G00" and "Eexp"
74- 78 F5.2 eV D09 ? Energy from Del Zanna (2009A&A...508..513D 2009A&A...508..513D)
80- 84 F5.2 eV Diff3 ? Difference between "D09" and "Eexp"
86- 93 E8.3 s LifeT ? Lifetime of the excited level
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Note (1): Reference flag as follows:
c = Del Zanna (2009A&A...508..513D 2009A&A...508..513D)
d = Landi & Young (2010ApJ...713..205L 2010ApJ...713..205L)
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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- 2 I2 --- i [1/101] Lower level
4- 6 I3 --- k [2/102] Upper level
8- 15 F8.2 0.1nm lambda [97/38316] Wavelength λ in Angstroms
17- 24 E8.2 --- S Line strength
26- 33 E8.2 --- fik Oscillator strength
35- 42 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 [1/101] Lower level
5- 7 I3 --- k [2/102] Upper level
9- 16 E8.2 --- CS0.5 Effective collision strength at 5000K
18- 25 E8.2 --- CS1 Effective collision strength at 10000K
27- 34 E8.2 --- CS2.5 Effective collision strength at 25000K
36- 43 E8.2 --- CS5 Effective collision strength at 50000K
45- 52 E8.2 --- CS10 Effective collision strength at 100000K
54- 61 E8.2 --- CS25 Effective collision strength at 250000K
63- 70 E8.2 --- CS50 Effective collision strength at 500000K
72- 79 E8.2 --- CS100 Effective collision strength at 1000000K
81- 88 E8.2 --- CS250 Effective collision strength at 2500000K
90- 97 E8.2 --- CS500 Effective collision strength at 5000000K
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 21-May-2013