J/A+A/508/1527 SiII Radiative transition rates (Bautista+, 2009)
Radiative transition rates and collision strengths for Si II.
Bautista M.A., Quinet P., Palmeri P., Badnell N., Dunn J., Arav N.
<Astron. Astrophys. 508, 1527 (2009)>
=2009A&A...508.1527B 2009A&A...508.1527B (SIMBAD/NED BibCode)
ADC_Keywords: Atomic physics
Keywords: atomic data - atomic processes - line: formation -
quasars: absorption lines - Sun: abundances - ISM: atoms
Abstract:
This work reports on radiative transition rates and electron impact
excitation collision strengths for levels of the 3s23p, 3s3p2,
3s24s, and 3s23d configurations of Si II.
The radiative data were computed using the Thomas-Fermi-Dirac-Amaldi
central potential, but with the modifications introduced by Bautista
(2008, J. Phys. B: Atom. Mol. Opt. Phys., 41, 065701) that account for
the effects of electron-electron interactions. We also introduce new
schemes for the optimization of the variational parameters of the
potential. Additional calculations were carried out with the
Relativistic Hartree-Fock and the multiconfiguration Dirac-Fock
methods. Collision strengths in LS-coupling were calculated in the
close coupling approximation with the R-matrix method. Then, fine
structure collision strengths were obtained by means of the
intermediate-coupling frame transformation (ICFT) method which
accounts for spin-orbit coupling effects.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table7.dat 88 29 gf-values and radiative transition rates
(A-values) for dipole allowed transitions
table8.dat 89 153 Maxwellian averaged collision strengths
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Byte-by-byte Description of file: table7.dat
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Bytes Format Units Label Explanations
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1 I1 --- i Index of lower level
3- 4 I2 --- j Index of upper level
6- 12 F7.2 0.1nm lambda Wavelength
14- 19 F6.3 [-] log(gf) Oscillator strength value (in log10)
21- 25 F5.3 [-] e_log(gf) rms uncertainty on log(gf)
27- 34 E8.3 s-1 A Radiative transition rate
36- 43 E8.3 s-1 e_A rms uncertainty on A
45- 66 A22 --- lLevel Lower level
69- 88 A20 --- uLevel Upper level
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Byte-by-byte Description of file: table8.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- i Index of lower level
4- 5 I2 --- j Index of upper level
7- 17 E11.6 --- ECS1 Effective collision strengths for T=5.0000E+03K
19- 29 E11.6 --- ECS2 Effective collision strengths for T=7.5000E+03K
31- 41 E11.6 --- ECS3 Effective collision strengths for T=1.0000E+04K
43- 53 E11.6 --- ECS4 Effective collision strengths for T=1.2500E+04K
55- 65 E11.6 --- ECS5 Effective collision strengths for T=1.5000E+04K
67- 77 E11.6 --- ECS6 Effective collision strengths for T=1.7500E+04K
79- 89 E11.6 --- ECS7 Effective collision strengths for T=2.0000E+04K
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Acknowledgements:
M.A. Bautista, manuel.bautista(at)wmich.edu
(End) Patricia Vannier [CDS] 28-Dec-2009