J/ApJS/188/32 Breit-Pauli transition probabilities for SII (Tayal+, 2010)
Breit-Pauli transition probabilities and electron excitation collision
strengths for singly ionized sulfur.
Tayal S.S., Zatsarinny O.
<Astrophys. J. Suppl. Ser., 188, 32-45 (2010)>
=2010ApJS..188...32T 2010ApJS..188...32T
ADC_Keywords: Atomic physics
Keywords: atomic data - atomic processes
Abstract:
New improved calculations are reported for transition probabilities
and electron impact excitation collision strengths for the
astrophysically important lines in SII. The collision strengths have
been calculated in the close-coupling approximation using the B-spline
Breit-Pauli R-matrix method. 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 70 bound levels of SII covering all
possible terms of the ground 3s23p3 and singly excited 3s3p4,
3s23p23d, 3s23p24s, and 3s23p24p configurations. The present
calculations are more extensive than previous ones, leading to a total
2415 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 5000 to 100000K. The present results are compared
with a variety of other close-coupling calculations and available
experimental data. There is an overall good agreement with the recent
18-state calculations by Ramsbottom, Bell, & Stafford and with the
19-state calculations by Tayal for the most part, but some 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
table1.dat 70 70 Energies and lifetimes of the excitation levels
table4.dat 90 806 Line strengths, oscillator strengths, and
transition probabilities for E1 transitions
table5.dat 93 2415 Effective collision strengths for transitions in SII
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See also:
J/A+A/420/783 : Electron impact excitation of Fe XVII (Aggarwal+, 2004)
J/A+A/430/725 : N II effective collision strengths (Hudson+, 2005)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- Index [1/70] Index
4- 16 A13 --- Conf Configuration
20- 31 A12 --- LSJ LSJ term
33- 38 F6.3 eV Eexp Expected excitation energy
40- 45 F6.3 eV E Present excitation energy
47- 52 F6.3 eV dE Excitation energy difference (E-Eexp)
54- 61 E8.3 s LF ? Present lifetime
63- 70 E8.3 s LFM ? Breit-Pauli MCHF lifetime (Irimia &
Froese Fischer, 2007, Phys. Scr., 71, 172)
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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- 26 A26 --- Conf.i The i level configuration
28- 53 A26 --- Conf.k The k level configuration
55- 64 F10.2 0.1nm lambda Wavelength in Angstroms
66- 73 E8.4 --- Sik The i-k transition line strength
75- 82 E8.4 --- fik The i-k transition oscillator strength
84- 90 E7.3 s-1 Aki The i-k transition decay 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- 2 I2 --- i [1/69] The i level configuration
3 A1 --- --- [-] transition
4- 5 I2 --- k [2/70] The k level configuration
7- 13 E7.2 --- 0.5CS Effective collision strength at T=5kK
15- 21 E7.2 --- 0.7CS Effective collision strength at T=7kK
23- 29 E7.2 --- 1.0CS Effective collision strength at T=10kK
31- 37 E7.2 --- 1.5CS Effective collision strength at T=15kK
39- 45 E7.2 --- 2.0CS Effective collision strength at T=20kK
47- 53 E7.2 --- 2.5CS Effective collision strength at T=25kK
55- 61 E7.2 --- 3.0CS Effective collision strength at T=30kK
63- 69 E7.2 --- 4.0CS Effective collision strength at T=40kK
71- 77 E7.2 --- 5.0CS Effective collision strength at T=50kK
79- 85 E7.2 --- 7.0CS Effective collision strength at T=70kK
87- 93 E7.2 --- 10CS Effective collision strength at T=100kK
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 09-Jun-2010