Fe IV - VERSION 8.0


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

  1. fe_4.elvlc (energy levels)
  2. contains the energy levels (in cm-1). It includes both experimental and theoretical values of the levels energies.

     
    %filename: fe_4.elvlc
    %observed energies: Version 3 of the NIST Atomic Spectra Database
       Available from http://physics.nist.gov/PhysRefData/ASD/index.html
    %theoretical energies: These were not provided by Zhang & Pradhan (1997) so observed energies are used.
    %comment: The numbers in brackets in the configuration column differentiate duplicate
       terms in the configuration. E.g., there are three 2D terms in the 3d5
       configuration. The numbering duplicates that at NIST.
    % produced as part of the Arcetri/Cambridge/NRL 'CHIANTI' atomic data base collaboration
    %
    %   Peter Young, 31-Aug-2009
     
    

  3. fe_4.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: fe_4.wgfa
    %observed energies: Version 3 of the NIST Atomic Spectra Database
       Available from http://physics.nist.gov/PhysRefData/ASD/index.html
    %A-values: Froese Fischer, C., Rubin, R.H., Rodriguez, M. 2008, MNRAS, 391, 1828
    % produced as part of the Arcetri/Cambridge/NRL 'CHIANTI' atomic data base collaboration
    %
    %   Peter Young, 31-Aug-2009
    

  5. fe_4.scups (electron collision data)
  6. contains the effective electron collision strengths scaled according to the rules formulated by Burgess and Tully (1992).

     
    %file:  fe_4.splups
    %Theoretical energies: Observed energies from .elvlc file.
    %Effective collision strengths: Zhang, H.L. & Pradhan, A.K. 1997, A&AS, 126, 373
    %Comment: The fits reproduce the original data to 1.6 % or better over the temperature range 2000 to 500,000 K.
    % produced as part of the Arcetri/Cambridge/NRL 'CHIANTI' atomic data base collaboration
    %
    % Peter Young, 31-Aug-2009
    %  - changed fits for 13-34 and 14-35 in order to remove negative spline
    %    values (PRY, 26-Oct-2011)
    %  - changed file from PC format to Unix format (PRY, 14-Nov-2011)
    
    

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

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

    Page created by Giulio Del Zanna on Fri Sep 18 13:27:23 2015