Cr II - VERSION 11.0.1

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

  1. cr_2.elvlc (energy levels)

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

     
%File prepared for the CHIANTI atomic database by Peter Young.
%File:  cr_2.elvlc
%Theoretical energies:
    Tayal S.S., Zatsarinny O., 2020, ApJ, 888, 10
%Observed energies: 
    Kramida, A., Ralchenko, Yu., Reader, J., and NIST ASD Team (2019).
    NIST Atomic Spectra Database (ver. 5.7.1), [Online].
    Available: https://physics.nist.gov/asd [2020, July 23].
    National Institute of Standards and Technology, Gaithersburg, MD.
    DOI: https://doi.org/10.18434/T4W30F
%Comment:
    I assigned observed energies automatically by cross-matching configuration, term, J-value
    and energy with the Tayal data. Note that theoretical energies are in very good agreement
    with the NIST energies. Labels for the levels come from NIST.

  2. cr_2.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. 

     
%File prepared for the CHIANTI atomic database by Peter Young.
%File:  cr_2.wgfa
%A-values:
    Tayal S.S., Zatsarinny O., 2020, ApJ, 888, 10
%gf-values:
    Tayal S.S., Zatsarinny O., 2020, ApJ, 888, 10
%Wavelengths:
    Derived from energies in elvlc file.
%File processed with wgfa_tidy by pryoung on 23-Jul-2020
%File processed with wgfa_tidy by pryoung on 31-May-2023

  3. cr_2.scups (electron collision data)

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

     
    513 transitions were fit by hand with write_scups_gui. No problems with the data were found.
    Of the 50322 transitions, most were fit automatically with write_scups.pro. The remaining   
    data file only covers 10^3 to 10^5 K.                                                       
    Tayal & Zatsarinny stated that their upsilons were computed from 10^2 to 10^5 K, but their  
    metastable levels (including ground).                                                       
    I removed transitions for which the lower level was not a metastable level. There are 117   
%Comment:                                                                                       
    Tayal S.S., Zatsarinny O., 2020, ApJ, 888, 10                                               
%Theoretical energies:                                                                          
    Tayal S.S., Zatsarinny O., 2020, ApJ, 888, 10 [taken from wgfa file]                        
%gf-values:                                                                                     
    Tayal S.S., Zatsarinny O., 2020, ApJ, 888, 10                                               
%Upsilons:                                                                                      
%File prepared for the CHIANTI atomic database by Peter Young.                                  
%File:  cr_2.scups

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

    5. The html tables below contain the radiative data of the brightest lines sorted in wavelength

    Page created by Giulio Del Zanna on Wed Apr 16 17:42:47 2025