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)

Ar XVIII - VERSION 5.1

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

  1. ar_18.elvlc (energy levels)

    2. 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.
%comment: 35699780      Limit
%comment: Theoretical energies are the same as the observed ones
%produced as part of the Arcetri/Cambridge/NRL 'CHIANTI' atomic data base collaboration CHIANTI
%
% K.P.Dere 1999

  2. ar_18.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. 

     
% A values: Parpia, F.A., Johnson, W.R., 1982, Phys. Rev. A, 26, 1142
%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
%oscillator strengths: Wiese,W.L., Smith,M.W., Glennon,B.M., 1966, Atomic Transition Probabilities, NSRDS-NBS-4
%comment:  hydrogenic f values
%produced as part of the Arcetri/Cambridge/NRL 'CHIANTI' atomic data base collaboration
%
% K.P.Dere 1998

  3. ar_18.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: ar_18.splups
%oscillator strengths: Wiese,W.L., Smith,M.W., Glennon,B.M., 1966, Atomic Transition Probabilities, NSRDS-NBS-4
%comment: hydrogenic f values
%effective collision strengths: interpolation of R-matrix calculations of Aggarwal,K.M., Kingston,A.E., 1991-1993
%comment: effective collision strengths are most accurate in the temperature range 5.0 < LogT < 7.0
%produced as part of the Arcetri/Cambridge/NRL 'CHIANTI' atomic data base collaboration
%  
% K.P.Dere - Aug 1998

  4. ar_18.splups (proton collisional data) Not available in this VERSION.

  5. ar_18.reclvl (total recombination population rates) 

    6.  
%filename: ar_18.reclvl
%Radiative recombination rates: Mewe, R, Gronenschild, E.H.B.M, and van den Oord, G.H.J, 1982, A&AS, 62, 197
%produced as part of the Arcetri/Cambridge/NRL 'CHIANTI' atomic data base collaboration
%
% E. Landi - Jan 2005

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

    ar_18_table.html (html table)


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