Si IX - VERSION 8.0


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

  1. si_9.elvlc (energy levels)
  2. contains the energy levels (in cm-1). It includes both experimental and theoretical values of the levels energies.

     
    %filename: si_9.elvlc
    %energy levels (n=2): Edlen, B., 1985, Physica Scripta, 31, 345
    %energy levels (6): Curdt, Landi & Feldman, 2004, A&A, 427, 1045
    %energy levels (n=3): Martin, W.C., Sugar, J., Musgrove, A., Dalton, G.R., 1995, 
       NIST Database for Atomic Spectroscopy, Version 1.0, NIST Standard Reference Database 61
    %Theoretical energy levels: Bhatia, A.K., Doschek, G.A., 1993, ADNDT, 55, 281
    %comment: the energy of level 6 has been determined from the wavelengths measured by Curdt et al. (2004) 
              and the energies of the levels 2s2.2p2 3P1,2 from Edlen 1985.
    % produced as part of the Arcetri/Cambridge/NRL 'CHIANTI' atomic data base collaboration
    %
    %   E. Landi - July 2007
     
    

  3. si_9.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_9.wgfa
    %observed energy levels: Martin, W.C., Sugar, J., Musgrove, A., Dalton, G.R., 1995,
        NIST Database for Atomic Spectroscopy, Version 1.0, NIST Standard Reference Database 61
    %energy levels (6): Curdt, Landi & Feldman, 2004, A&A, 427, 1045
    %Theoretical energy levels: Bhatia, A.K., Doschek, G.A., 1993, ADNDT, 55, 281
    %A-values (ground configuration): Galavis, M.E., Mendoza, C., Zeippen, C.J., 1997, A&AS, 123, 159
    %A values and oscillator strengths: Bhatia, A.K., Doschek, G.A., 1993, ADNDT, 55, 281
    %comment: the energy of level 6 has been determined from the wavelengths measured by Curdt et al. (2004)
              and the energies of the levels 2s2.2p2 3P1,2 from Edlen 1985.
    %produced as part of the Arcetri/Cambridge/NRL 'CHIANTI' atomic data base collaboration
    %
    %   E.Landi and P.R. Young -  6-Jul-2010
    

  5. si_9.scups (electron collision data)
  6. contains the effective electron collision strengths scaled according to the rules formulated by Burgess and Tully (1992).

     
    %filename: si_9.splups
    %oscillator strengths: Bhatia, A.K., Doschek, G.A., 1993, ADNDT, 55, 281
    %collision strengths: Bhatia, A.K., Doschek, G.A., 1993, ADNDT, 55, 281
    %effective collision strengths (ground configuration): Aggarwal, K.M., 1983, J.Phys.B, 16, L59
    %comment: Relativistic effects are not included in the Aggarwal calculations, but he
    does a comparison with the DW calcs of Mason & Bhatia (MNRAS 184, 423,
    1978) and finds good agreement. A comparison with the more recent Iron
    Project data of Lennon & Burke (AAS 103, 273, 1994) also shows good
    agreement.
    %comment: As Aggarwal did not present calculated energies, observed values have been used.
    %comment: effective collision strengths were provided in the temperature range 5.5 < Log T < 6.4
    %produced as part of the Arcetri/Cambridge/NRL 'CHIANTI' atomic data base collaboration
    %
    % Enrico Landi and Peter Young, Nov 2002
    
    

  7. si_9.psplups (proton collision data)
  8. contains the spline fits to the scaled proton collision strengths.

     
    
    %filename: si_9.psplups
    %rates: Ryans R.S.I., Foster-Woods V.J, Keenan F.P., Reid R.H.G., 1999, ADNDT 73, 1-42
    %energies: CHIANTI database, ver.1, Dere et al., A&AS 125, 149, 1997
    %comment: Fits valid for temperatures 2e5 to 3e7 K.
    %produced as part of the Arcetri/Cambridge/NRL 'CHIANTI' atomic data base collaboration
    %
    % Peter Young   10-Sep-2002
    


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

    si_9_table.html (html table)

    Page created by Giulio Del Zanna on Fri Sep 18 13:29:47 2015