CHIANTI

An Atomic Database for Spectroscopic Diagnostics of Astrophysical Plasmas.

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Naval Research Laboratory (USA) - Rutherford Appleton Laboratory (UK)
University of Cambridge (UK) - George Mason University (USA) - Universita' degli Studi di Firenze (Italy)

Fe XXI d - VERSION 4.2

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

  1. fe_21d.elvlc (energy levels)

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

     
%observed energy levels conf. 2s22p2, 2s2p3, 2p4: Martin, W.C., Sugar, J., Musgrove, A. and Dalton, G.R.,
   1995, NIST Database for Atomic Spectroscopy, Version 1.0, NIST Standard Reference Database 61
%observed energy levels conf. 2s22p3s and 2s22p3d:  Mason et al., 1979, A&A, 73, 74
%theoretical energy levels 2s22p2, 2s2p3, 2p4: Aggarwal, K.M., ApJSS, 1991, 77, 677
%theoretical energy levels 2s22p3s and 2s22p3d: Mason et al., 1979, A&A, 73, 74
%energy levels (above IP):  calculations of Safronova reported in Kato et al., 1997, ADNDT, 67, 225
% produced as part of the Arcetri/Cambridge/NRL 'CHIANTI' atomic data base collaboration
%
% E. Landi and Ken Dere  Aug 1999

  2. fe_21d.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. 

     
%observed energy levels conf. 2s22p2, 2s2p3, 2p4: Martin, W.C., Sugar, J., Musgrove, A. and Dalton, G.R.,
   1995, NIST Database for Atomic Spectroscopy, Version 1.0, NIST Standard Reference Database 61
%observed energy levels conf. 2s22p3s and 2s22p3d:  Mason et al., 1979, A&A, 73, 74
%theoretical energy levels 2s22p2, 2s2p3, 2p4: Aggarwal, K.M., ApJSS, 1991, 77, 677
%theoretical energy levels 2s22p3s and 2s22p3d: Mason et al., 1979, A&A, 73, 74
%energy levels (above IP):  calculations of Safronova reported in Kato et al., 1997, ADNDT, 67, 225
%Oscillator strengths, A values: P.R.Young (DAMTP, Un. of Cambridge, UK), SUPERSTRUCTURE calculations, 1996
%A values (above IP):  calculations of Safronova reported in Kato et al., 1997, ADNDT, 67, 225
%comment: theoretical energies have been used as experimental values for the dielectronic transitions
% produced as part of the Arcetri/Cambridge/NRL 'CHIANTI' atomic data base collaboration
%
%  E. Landi and Ken Dere   Aug 27 1999

  3. fe_21d.splups (electron collision data)

    4. contains the spline fits to the electron collision strengths scaled according the rules formulated by Burgess and Tully (1992). Accurate replication of the temperature averaged collision strength over a wide range of temperatures can be accomplished with the data in this file. 

     

%filename: fe_21d.splups
%collision strength values from calculations of Safronova reported in Kato et al., 1997, ADNDT, 67, 225
%comment: collision strengths from level 2P1/2
%produced as part of the Arcetri/Cambridge/NRL 'CHIANTI' atomic data base collaboration
%
% Ken Dere - Aug 1999

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

    fe_21d_table.html (html table)


    Last revised by G. Del Zanna on 4-Sep-2009