Si II - VERSION 8.0


The CHIANTI database has the following primary ASCII files for this ion:

  1. si_2.elvlc (energy levels)
  2. contains the energy levels (in cm-1). It includes both experimental and theoretical values of the levels energies.

     
    %filename: si_2.elvlc
    %observed energies: v.3 of the NIST Atomic Database
    %theoretical energies: Tayal, 2008, ApJS, 179, 534
    % produced as part of the Arcetri/Cambridge/NRL 'CHIANTI' atomic data base collaboration
    %
    %     Peter Young, Jan-2009
     
    

  3. si_2.wgfa (radiative data)
  4. contains wavelengths, gf and A values of the transitions. The wavelengths are based on the experimental energy levels and should be the best available. Wavelengths calculated from the theoretical energies are of an indeterminate accuracy and their values are presented as negative values of the calculated wavelength.

     
    %filename: si_2.wgfa
    %observed energies: v.3 of the NIST Atomic Database
    %theoretical energies: Tayal, 2008, ApJS, 179, 534
    %A-values: Tayal, S.S., 2007, J.Phys.B, 40, 2551
    %A-values: Nahar, S.N., 1998, ADNDT 68, 183
    %A-values: Nussbaumer, H. 1977, A&A, 58, 291
    %Comment: Both Nahar (1998) and Tayal (2007) give f-values so these have been converted to
        A-values using the observed energies.
        All data from Tayal (2007) have been used and these have been supplemented with
        Nahar (1998) for all remaining allowed transitions, and Nussbaumer (1977) for the
        ground transition.
    % produced as part of the Arcetri/Cambridge/NRL 'CHIANTI' atomic data base collaboration
    %
    %  Peter Young, Jan-2009
    

  5. si_2.scups (electron collision data)
  6. contains the effective electron collision strengths scaled according to the rules formulated by Burgess and Tully (1992).

     
    %filename: si_2.splups
    %theoretical energies: Tayal, S.S., 2008, ApJS, 179, 534
    %gf-values:  Tayal, S.S., 2007, J.Phys.B, 40, 2551 and Nahar, S.N., 1998, ADNDT 68, 183
    %Effective collision strengths:  Tayal, S.S., 2008, ApJS, 179, 534
    % produced as part of the Arcetri/Cambridge/NRL 'CHIANTI' atomic data base collaboration
    %
    %  Peter Young, Feb-2009
    
    

  7. si_2.psplups (proton collision data)
  8. contains the spline fits to the scaled proton collision strengths.

     
    
    %filename: si_2.psplups
    %rates: Bely, O., Faucher, P., 1970, A&A 6, 88
    %energies: Observed energies from .elvlc file.
    %produced as part of the Arcetri/Cambridge/NRL 'CHIANTI' atomic data base collaboration
    %
    % Peter Young   8-Jun-2001
    


    The html table below contains the radiative data of the brightest lines sorted in wavelength

    si_2_table.html (html table)

    Page created by Giulio Del Zanna on Fri Sep 18 13:29:43 2015