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 - VERSION 4.2

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

  1. fe_21.elvlc (energy levels)

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

     
%experimental energy levels: Shirai,T., Sugar,J., Musgrove,A., Wiese,W.L.,2000, J.Phys.Chem.Ref.Data, Monograph 8
%experimental energy levels (35,43,47,48): Mason et al., 1979, A&A, 73, 74
%observed energy levels configs. 4d,5d: Bromage, G.E., et al, 1977, Culham Lab. Report, CLM-R 170
%observed energy level 289: Shirai,T., Sugar,J., Musgrove,A., Wiese,W.L., 2000, J.Phys.Chem.Ref.Data, Monograph 8
%observed energy level 278, 284: Kelly, 1987, J.Phys.Chem.Ref.Data, 16, Suppl.1
%Observed energy levels (38,39,42,58,60,84,144,149): identifications from the X-ray spectral line list 
   by Brown et al., 2002, ApJS, 140, 589
%theoretical energy levels (1-200): Badnell, N.R., Griffin, D.C., 2001, J.Ph.B, 34, 681
%theoretical energy levels (201-274): Zhang, H.L., Sampson, D.H., 1997, ADNDT, 65, 183
%Theoretical energy levels (275-290): Phillips et al, 1996, ApJ, 466, 549
%Comments:
 1 - The observed energies for levels 38 and 44 (2p3d 3D2, 1D2) have been interchanged to match theoretical energies
 2 - The observed energies for 5d levels 278 (1D2) and 287 (3P2) have been interchanged to match theoretical energies
 3 - Level 289 (5d 1F3) was misidentified in Bromage et al, and its energy has been attributed to level 279 (5d 3F3)
%
%produced as part of the Arcetri/Cambridge/NRL 'CHIANTI' atomic data base collaboration
%
% E. Landi Aug 2002

  2. fe_21.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. 

     
%Experimental energy levels: Shirai,T., Sugar,J., Musgrove,A., Wiese,W.L.,2000, J.Phys.Chem.Ref.Data, Monograph 8
%experimental energy levels (35,43,47,48): Mason et al., 1979, A&A, 73, 74
%observed energy levels configs. 4d,5d: Bromage, G.E., et al, 1977, Culham Lab. Report, CLM-R 170
%observed energy level 289: Shirai,T., Sugar,J., Musgrove,A., Wiese,W.L., 2000, J.Phys.Chem.Ref.Data, Monograph 8
%observed energy level 278, 284: Kelly, 1987, J.Phys.Chem.Ref.Data, 16, Suppl.1
%Observed energy levels (38,39,42,58,60,84,144,149): identifications from the X-ray spectral line list
   by Brown et al., 2002, ApJS, 140, 589
%Theoretical energy levels (1-200): Badnell, N.R., Griffin, D.C., 2001, J.Phys.B, 34, 681
%Theoretical energy levels (201-274): Zhang, H.L., Sampson, D.H., 1997, ADNDT, 65, 183
%Theoretical energy levels (275-290): Phillips et al, 1996, ApJ, 466, 549
%Radiative data: Badnell, N.R., Griffin, D.C., 2001, J.Phys.B, 34, 681
%Radiative data within ground configuration: P.R.Young, SUPERSTRUCTURE calculations, 1996
%Radiative data 2p33l (except 2p33s 5S2 and 3S1, coming from Badnell): 
    Zhang, H.L., Sampson, D.H., 1997, ADNDT, 65, 183
%Radiative data n=5 levels: Phillips et al, 1996, ApJ, 466, 549
% produced as part of the Arcetri/Cambridge/NRL 'CHIANTI' atomic data base collaboration
%
% Enrico Landi Aug 2002

  3. fe_21.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_21.splups
%oscillator strengths (1-200): Badnell, N.R., Griffin, D.C., 2001, J.Phys.B, 34, 681
%effective collision strengths (1-200): Badnell, N.R., Griffin, D.C., 2001, J.Phys.B, 34, 681
%oscillator strengths (201-274): Zhang, H.L., Sampson, D.H., 1997, ADNDT, 65, 183
%collision strengths (201-274): Zhang, H.L., Sampson, D.H., 1997, ADNDT, 65, 183
%oscillator strengths, A values n=4,5 (275-290): Phillips et al, 1996, ApJ, 466, 549
%collision strengths n=4,5 (275-290): Phillips et al, 1996, ApJ, 466, 549
%comment: Effective collision strengths for levels 1-200 are used in the temperature range 6.3 < Log T < 7.9
% produced as part of the Arcetri/Cambridge/NRL 'CHIANTI' atomic data base collaboration
%
% E.Landi Apr 2001

  4. fe_21.psplups (proton collision data)

    5. contains the spline fits to the scaled proton collision strengths. 

     

%filename: fe_21.psplups
%rates: Ryans R.S.I., Foster-Woods V.J, Keenan F.P., Reid R.H.G., 1999, ADNDT 73, 1-42
%energies: CHIANTI database, ver.1, Dere et al., A&AS 125, 149, 1997
%comment: Fits valid for temperatures 1.5e6 to 1.5e8 K.
%produced as part of the Arcetri/Cambridge/NRL 'CHIANTI' atomic data base collaboration
%
% Peter Young   10-Sep-2002

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


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