/ftp/cats/A+A/508/1527



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J/A+A/508/1527      SiII Radiative transition rates          (Bautista+, 2009)
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Beginning of ReadMe : 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 (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 3s^2^3p, 3s3p^2^, 3s^2^4s, and 3s^2^3d 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.

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