Ca XX - VERSION 11.0.1

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

  1. ca_20.elvlc (energy levels)

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

     
%filename: ca_20.elvlc
%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.
%comment:   44117410      Limit
%produced as part of the Arcetri/Cambridge/NRL 'CHIANTI' atomic data base collaboration
%
% K.P.Dere 1999

  2. ca_20.wgfa (radiative data)

    3. 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_20.wgfa
%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: Parpia, F.A., Johnson, W.R., 1982, Phys.Rev.A, 26, 1142.
%oscillator strengths: Wiese, W.L., Smith, M.W., Glennon, B.M., 1966, Atomic Transition Probabilities, NSRDS-NBS-4.
%note:  hydrogenic f values
%produced as part of the Arcetri/Cambridge/NRL 'CHIANTI' atomic data base collaboration
%
% K.P.Dere 1998
%File processed with wgfa_tidy by pryoung on  6-Mar-2019
%File processed with wgfa_tidy by pryoung on 31-May-2023

  3. ca_20.scups (electron collision data)

    4. contains the effective electron collision strengths scaled according to the rules formulated by Burgess and Tully (1992). 

     
% Ken Dere - Aug 1998                                                                                          
%                                                                                                              
%produced as part of the Arcetri/Cambridge/NRL 'CHIANTI' atomic data base collaboration                        
%comment: effective collision strengths were provided in the temperature range 5.0 < Log T < 7.2               
%comment: fine structure collision assumes LS coupling or distribution according to statistical weights        
%effective collision strengths: Aggarwal,K.M., Kingston, A.E., 1992, J. Phys. B, 25, 751                       
%comment: hydrogenic oscillator strengths values                                                               
%oscillator strengths: Wiese,W.L., Smith,M.W., Glennon,B.M., 1966, Atomic Transition Probabilities, NSRDS-NBS-4
%filename: ca_20.splups

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

  5. ca_20.reclvl (total recombination population rates) 

    6.  
%filename: ca_20.reclvl
%Radiative recombination rates: Mewe, R, Gronenschild, E.H.B.M, and van den Oord, G.H.J, 1982, A&AS, 62, 197
%produced as part of the Arcetri/Cambridge/NRL 'CHIANTI' atomic data base collaboration
%
% E. Landi - Aug 2006

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

    ca_20_table.html (html table)

    Page created by Giulio Del Zanna on Wed Apr 16 17:42:25 2025