Ca II - VERSION 8.0


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

  1. ca_2.elvlc (energy levels)
  2. contains the energy levels (in cm-1). It includes both experimental and theoretical values of the levels energies.

     
    %filename:  ca_2.elvlc
    %observed energies: v.3 of the NIST Atomic Database
    %theoretical energies: These were not published by Melendez et al. (2007) so the observed energies have been used.
    %comment: Some of the fine structure levels arising from the same spectroscopic
       term are given the same energy value in the NIST database. For CHIANTI,
       an artificial separation of 1 cm^-1 has been applied to these levels.
    % produced as part of the Arcetri/Cambridge/NRL 'CHIANTI' atomic data base collaboration
    %
    %      Peter Young, Jan 2009
     
    

  3. ca_2.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: ca_2.wgfa
    %observed energies: v.3 of the NIST Atomic Database
    %A-values: Melendez, Bautista, & Badnell, 2007, A&A, 469, 1203
    %gf-values: derived from A-values and experimental energies.
    %Comment: Melendez et al. did not provide gf-values. These have been derived
          from the A-values, assuming that allowed transitions have A-values
          greater than 1e5.
    % produced as part of the Arcetri/Cambridge/NRL 'CHIANTI' atomic data base collaboration
    %
    %      Peter Young, Jan 2009
    

  5. ca_2.scups (electron collision data)
  6. contains the effective electron collision strengths scaled according to the rules formulated by Burgess and Tully (1992).

     
    %filename: ca_2.splups
    %Theoretical energies: observed energies from .elvlc file used.
    %gf-values: derived from A-values of Melendez, Bautista, & Badnell, 2007, A&A, 469, 1203 and experimental energies.
    %effective collision strengths:  Melendez, Bautista, & Badnell, 2007, A&A, 469, 1203
    %Comment: The original data provided in the Melendez paper had problems with the high
    temperature limits so Melendez re-computed the upsilons and it is these that
    I have fit.
    Melendez et al. did not give theoretical energies or gf-values. I have used
    observed energies in place of theoretical energies, and the gf-values have
    been calculated from the A-values calculated by Melendez et al. - see the .wgfa
    file.
    % produced as part of the Arcetri/Cambridge/NRL 'CHIANTI' atomic data base collaboration
    %
    %      Peter Young, Mar 2009
    
    

  7. (proton collisional data) Not available in this VERSION.

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

    ca_2_table.html (html table)

    Page created by Giulio Del Zanna on Fri Sep 18 13:25:32 2015