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. =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. File Summary: -------------------------------------------------------------------------------- FileName Lrecl Records Explanations -------------------------------------------------------------------------------- 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 -------------------------------------------------------------------------------- Byte-by-byte Description of file: table7.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 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 log_10_) 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 -------------------------------------------------------------------------------- Byte-by-byte Description of file: table8.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 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 -------------------------------------------------------------------------------- Acknowledgements: M.A. Bautista, manuel.bautista(at)wmich.edu ================================================================================ (End) Patricia Vannier [CDS] 28-Dec-2009