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

cl_2.elvlc (energy levels)

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

 
%observed energy levels: Fuhr, J.R., et al., "NIST Atomic Spectra Database" Ver. 2.0, March 1999, NIST Physical Reference Data
%theoretical energy levels: Wilson, N.J., Bell, K.L. 2002, MNRAS 331, 389
% produced as part of the Arcetri/Cambridge/NRL 'CHIANTI' atomic data base collaboration
%
%  P.R. Young - 20-May-02
 

cl_2.wgfa (radiative data)

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.

 
%observed energy levels: Fuhr, J.R., et al., "NIST Atomic Spectra Database" Ver. 2.0, March 1999, NIST Physical Reference Data
%A-values: From SSTRUCT calculation. See comments below.
%comments: The A-values were derived using the code SSTRUCT, with a model of the 
   Cl II ion that contained the following 14 configurations:

   3s2.3p4
   3s.3p5
   3s2.3p3.3d
   3s2.3p3.4l  (l=s,p,d,f)
   3s2.3p3.5l  (l=s,p,d,f,g)
   3s2.3p3.6l  (l=s,p)

   Note that SSTRUCT is not best suited to ions with low charges, and 
   the derived A-values may not be good. However, there are no other values 
   in the literature.

% produced as part of the Arcetri/Cambridge/NRL 'CHIANTI' atomic data base collaboration
%
%  P.R. Young - 11-Jun-2002

cl_2.splups (electron collision data)

contains the spline fits to the electron collision strengths scaled according the rules formulated by 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.

 

%filename: cl_2.splups
%theoretical energy levels: Wilson, N.J., Bell, K.L. 2002, MNRAS 331, 389
%effective collision strengths: Wilson, N.J., Bell, K.L. 2002, MNRAS 331, 389 and MNRAS 338, 544
%comment: Wilson & Bell gave theoretical energies only for LS-resolved levels.
    For the 3P level splitting observed energies were used.
%comment: An erratum was published in MNRAS 338, 544, revising the upsilons for 
    transition 4-5. This has been corrected.
% produced as part of the Arcetri/Cambridge/NRL 'CHIANTI' atomic data base collaboration
%
%  P.R. Young - 23-Jan-03

cl_2.splups (proton collisional data) Not available in this VERSION.

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

cl_2_table.html (html table)


Last revised by G. Del Zanna on 4-Sep-2009