Ca II - VERSION 11.0.1

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

ca_2.elvlc (energy levels)

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

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
%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

 minimum branching ratio =   1.00e-05  :  K Dere  - 2017 December 16
%File processed with wgfa_tidy by pryoung on  6-Mar-2019
%File processed with wgfa_tidy by pryoung on 31-May-2023

ca_2.scups (electron collision data)

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

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

(proton collisional data) Not available in this VERSION.

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

ca_2_table.html (html table)