S II - VERSION 5.1

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

• s_2.elvlc (energy levels)

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

  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: Ramsbottom C.A., Bell K.L., Stafford R.P., 1996, ADNDT, 63, 57
  %comment:
     This file has been modified from the one in v.2 of the database.
     Levels 6, 7 and 8, and levels 11 and 12 have been reversed to 
     match the ordering of Ramsbottom et al. Also the theoretical 
     energies are now those of Ramsbottom et al. These energies are 
     from LS coupling and so there is no fine structure splitting.
  % produced as part of the Arcetri/Cambridge/NRL 'CHIANTI' atomic data base collaboration
  %
  %  Peter Young, Feb 2000
  

  
  

• s_2.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
  %A-values: Nahar, S., private communication, 2001
  %A-values: Ground transitions: Binello, A.M., private communication
  %A-values: 3 - 19; all transitions involving level 40: Young, P.R., SSTRUCT calculation
  %A-values: 8 - 19, 10 - 19, 18 - 19: Binello, A.M.
  %comment: Sultana Nahar provided A-values for all allowed transitions. This 
       work was an extension of the work presented in ADNDT 68, 183, 1998, 
       and includes extra intercombination decays.
  For the forbidden transitions amongst the ground levels, the A-values 
       of A.M. Binello used in earlier versions of CHIANTI are retained. 
       Level 19 is metastable and 3 forbidden transitions calculated by A.M. 
       Binello are retained, together with 1 forbidden transition calculated 
       by P.R. Young. Level 40 is also metastable and A-values have been 
       calculated by P.R. Young using SSTRUCT.
  %comment: PRY, 6-Mar-03: levels 11 and 12 had been mixed up for this file. 
            Affects lines from these levels (1096, 1102 A)
  % produced as part of the Arcetri/Cambridge/NRL 'CHIANTI' atomic data base collaboration
  %
  %  Peter Young, Mar 2003
  

  
  

• s_2.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: s_2.splups
  %oscillator strengths: from .wgfa file
  %effective collision strengths: Ramsbottom C.A., Bell K.L., Stafford R.P., 1996, ADNDT 63, 57
  %comment: Ramsbottom et al. gave only LS energy levels, and so where 
      transitions occur between levels of the same LS numbers, the 
      Delta-E would be zero. For these cases I've used the observed 
      energy level splitting.
  %produced as part of the Arcetri/Cambridge/NRL 'CHIANTI' atomic data base collaboration
  %
  % Peter Young - Dec 2001
  

  
  

• s_2.psplups (electron collision data) - Not Present in CHIANTI 5.1

  contains the spline fits to the scaled proton collision strengths.
  

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

  
  

• s_2_table.html (html table)