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

ar_12.elvlc (energy levels)

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

 
%Observed energy levels (1 - 15): Edlen, 1984, Phys.Scripta, 30, 135
%Observed energy levels (n=3): NIST Database for Atomic Spectroscopy, Version 2.0, 1999, NIST Standard Reference Database # 78
%Theoretical energy levels: Eissner, Landi & Bhatia 2005, ADNDT, 89, 195
%comment: theoretical energy levels come from the 24-configuration calculation in Eissner, Landi & Bhatia (2005)
% produced as part of the Arcetri/Cambridge/NRL 'CHIANTI' atomic data base collaboration
% 
% Enrico Landi - Oct 2003
 

ar_12.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.

 
%Observed energy levels (1 - 15): Edlen, 1984, Phys.Scripta, 30, 135
%Observed energy levels (n=3): NIST Database for Atomic Spectroscopy, Version 2.0, 1999, NIST Standard Reference Database # 78
%Theoretical energy levels: Eissner, Landi & Bhatia 2005, ADNDT, 89, 195
%A and gf values: Eissner, Landi & Bhatia 2005, ADNDT, 89, 195
%comment: theoretical energy levels and all radiative data come from the 24-configuration calculation in Eissner et al (2005)
% produced as part of the Arcetri/Cambridge/NRL 'CHIANTI' atomic data base collaboration
%
% Enrico Landi - Oct 2003

ar_12.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_12.splups
%Oscillator strengths: Eissner, Landi & Bhatia 2005, ADNDT, 89, 195
%Collision strengths: Eissner, Landi & Bhatia 2005, ADNDT, 89, 195
%comment: oscillator strengths have been taken from the 6-configuration model of Eissner et al.
    (2005) for consistency with the collisional calculation
%produced as part of the Arcetri/Cambridge/NRL 'CHIANTI' atomic data base collaboration
%
% E. Landi - Oct 2003

ar_12.splups (proton collisional data) Not available in this VERSION.

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

ar_12_table1.html (html table -- 30.9370 -- 776.9820 A)

ar_12_table2.html (html table -- 1018.7260 -- 1839.5909 A)


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