S III - VERSION 5.1

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

• s_3.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: Johansson L., Magnusson C.E., Joelsson I., Zetterberg P.O., Physica Scripta 46, 221, 1992
  %theoretical energy levels: Tayal S.S., Gupta G.P., ApJ 526, 544, 1999
  %comment Level ordering is from Tayal & Gupta.
  %comment: Note that Tayal & Gupta do not include the 3F and 1F terms from the 
            3p.4d configuration in their S III model.
  %Produced as part of the Arcetri/Cambridge/NRL 'CHIANTI' atomic data base collaboration
  %
  % P.R. Young, Dec-99
  

  
  

• s_3.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: Johansson L., Magnusson C.E., Joelsson I., Zetterberg P.O., Physica Scripta 46, 221, 1992
  %theoretical energy levels: Tayal S.S., Gupta G.P., ApJ 526, 544, 1999
  %comment: The wavelengths are not those given in Table III of Tayal as these are 
     slightly different from the observed ones. I have not scaled the gf 
     and A-values by the ratio of observed and theoretical wavelengths.
  %A-values (allowed transitions): Tayal S.S., 1997, ADNDT 67, 331
  %gf-values: Tayal S.S., 1997, ADNDT 67, 331
  %A-values (ground trans.): Huang K.-N., 1985, ADNDT 32, 503
  %A-values (involving level 16): P.R.Young, 2000 Superstructure calculation
  %comment: Level 16 is metastable, and I have calculated E2, M1 and M2 transition 
     probabilities using SUPERSTRUCTURE. For the model of the ion, I included 
     the six configurations of the CHIANTI model
  %Produced as part of the Arcetri/Cambridge/NRL 'CHIANTI' atomic data base collaboration
  %
  %   Peter Young, Dec 1999
  

  
  

• s_3.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_3.splups
  %oscillator strengths: Tayal S.S., 1997, ADNDT 67, 331
  %effective collision strengths: Tayal S.S., Gupta R.P., 1999, ApJ, 526, 544
  %comment: effective collision strengths were used in the temperature range 4.3 < Log T < 5.0
  %comment: The three low temperature points for the transitions up to levels 42 
     to 49 are unreliable (Tayal, private communication) and so only the five 
     highest temperature points for these transitions were fitted.
  %produced as part of the Arcetri/Cambridge/NRL 'CHIANTI' atomic data base collaboration
  %
  %  Peter Young, May 2000
  

  
  

• s_3.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_3_table.html (html table)