C II - VERSION 11.0

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

c_2.elvlc (energy levels)

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

 
 
 Experimental energies (levels 1 to 5):
Young, P. R., Feldman, U. & Lobel, A., 2011, ApJS 196, 23
   DOI: 10.1088/0067-0049/196/2/23

 Experimental energies (all others):
Kramida, A., Ralchenko, Yu., Reader, J., and NIST ASD Team (2013).
NIST Atomic Spectra Database (ver. 5.1), see http://physics.nist.gov/asd

Theoretical energies:
G Y Liang, N R Badnell and G Zhao  A&A 547, A87 (2012)
   DOI: 10.1051/0004-6361/201220277

 Produced for the CHIANTI database v.8 by G. Del Zanna 28 Apr 2014

 Updated, Peter Young, 14-Jul-2016
  - replaced energies for 1-5 levels with Young et al. (2011)
  - energies for levels 6 & 7 have been swapped
  - 2nd and 3rd decimal places for NIST energies have been corrected

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.

 
Theoretical energies, gf and A-values:
G Y Liang, N R Badnell and G Zhao  A&A 547, A87 (2012)
   DOI: 10.1051/0004-6361/201220277
   
   Note: only transitions with a branching ratio above 10^-5 
have been retained.

A-values for transitions from some of the lower levels 
are from Correge, G. & Hibbert, A. 2004, ADNDT, 86, 19


Produced for the CHIANTI database v.8 by Giulio Del Zanna  Oct 2013

Updated, 14-Jul-2016, Peter Young
  - used updated .elvlc file for computing wavelengths

%File processed with wgfa_tidy by pryoung on  6-Mar-2019
%File processed with wgfa_tidy by pryoung on 31-May-2023

c_2.scups (electron collision data)

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

 

                                                                
Produced for the CHIANTI database v.8 by G. Del Zanna 5 May 2014
                                                                
   DOI: 10.1051/0004-6361/201220277                             
G Y Liang, N R Badnell and G Zhao  A&A 547, A87 (2012)          
Data  from

c_2.psplups (proton collision data)

contains the spline fits to the scaled proton collision strengths.

 

%filename: c_2.psplups
%rates: Foster VJ, Keenan FP, Reid RHG, ADNDT 67, 99, 1997
%energies: From .elvlc file, experimental energies
%comment: The rate coefficients are in units cm^3/s.
%comment: Fits are valid for temperatures 2e3 to 4e5 K.
%produced as part of the Arcetri/Cambridge/NRL 'CHIANTI' atomic data base collaboration
%
% Peter Young   15-May-2001

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

c_2_table.html (html table)