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

ar_7.elvlc (energy levels)

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

 
%energy levels: Martin, W.C., Sugar, J., Musgrove, A., Dalton, G.R., 1995, 
   NIST Database for Atomic Spectroscopy, Version 1.0, NIST Standard Reference Database 61.
%theoretical energy levels: Pradhan, Ph.Rev.A, 34, 4704, 1986
%produced as part of the Arcetri/Cambridge/NRL 'CHIANTI' atomic data base collaboration
%
% E. Landi 1995
 

ar_7.wgfa (radiative data)

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.

 
%oscillator strengths: Christensen et al, 1986, Ph.Rev.A, 4704, 34
%energy levels: Martin, W.C., Sugar, J., Musgrove, A., Dalton, G.R., 1995, 
   NIST Database for Atomic Spectroscopy, Version 1.0, NIST Standard Reference Database 61
% A values (3:4): Martin, W.C., Sugar, J., Musgrove, A., Dalton, G.R., 1995,
   NIST Database for Atomic Spectroscopy, Version 1.0, NIST Standard Reference Database 61
% A values (1:4): Calculated using SUPERSTRUCTURE and the same atomic model adopted
   by Christensen, Norcross, Pradhan, 1986, Ph.Rev.A, 34, 4704,
%produced as part of the Arcetri/Cambridge/NRL 'CHIANTI' atomic data base collaboration
%
% E. Landi 2000

ar_7.splups (electron collision data)

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: ar_7.splups
%oscillator strengths: Christensen et al, 1986, Ph.Rev.A, 4704, 34
%collision strengths: Pradhan, 1986, Ph.Rev.A, 4704, 34
%produced as part of the Arcetri/Cambridge/NRL 'CHIANTI' atomic data base collaboration
%
% E. Landi 1995

ar_7.psplups (proton collision data)

contains the spline fits to the scaled proton collision strengths.

 

%filename: ar_7.psplups
%rates: Landman, D.A., Brown, T., 1979, ApJ 232, 636
%energies: Observed energies from CHIANTI .elvlc file.
%produced as part of the Arcetri/Cambridge/NRL 'CHIANTI' atomic data base collaboration
%
% Peter Young   18-May-2001

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

ar_7_table.html (html table)


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