Si IX - VERSION 4.0

The CHIANTI database consists of 4 primary ASCII files for each ion in the database.

• si_9.elvlc (energy levels)

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

  References:

  %energy levels (n=2): Edlen, B., 1985, Physica Scripta, 31, 345
  %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
  % produced as part of the Arcetri/Cambridge/NRL 'CHIANTI' atomic data base collaboration
  %
  %   E.Landi 2000
  

  
  

• si_9.wgfa (radiative data)

  contains wavelengths, gf and A values for each transition. Wavelengths are based on experimental level energies where available; wavelengths calculated from theoretical energies are less accurate and are given as negative values.

  References:

  %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
  %Theoretical energy levels: Bhatia, A.K., Doschek, G.A., 1993, ADNDT, 55, 281
  %oscillator strengths: Bhatia, A.K., Doschek, G.A., 1993, ADNDT, 55, 281
  %produced as part of the Arcetri/Cambridge/NRL 'CHIANTI' atomic data base collaboration
  %
  %   E.Landi 1995
  

  
  

• si_9.splups (electron collision data)

  contains the spline fits to the electron collision strengths scaled according to Burgess and Tully (1992). Accurate replication of the temperature averaged collision strength over a wide range of temperatures can be accomplished with the data in this file.

  References:

  
  %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, Oct 1997
  

  
  

• si_9.psplups (electron collision data)

  contains the spline fits to the scaled proton collision strengths.

  References:

  
  %filename: si_9.psplups
  %rates: Ryans R.S.I., Foster-Woods V.J, Keenan F.P., Reid R.H.G., 1999, ADNDT 73, 1
  %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
  %
  % P.R.Young - May 2001
  

The html tables below contain the radiative data of all the lines sorted in wavelength