Ar XVIII - VERSION 8.0


The CHIANTI database has 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.

     
    %filename: ar_18.elvlc
    %observed energy levels (levels 3,4): Phillips, K.J.H., Sylwester, J., Sylwester, B., Landi, E. 2003, ApJ, 589, L113
    %observed energy levels (all other levels): Ralchenko, Yu., Kramida, A.E., Reader, J., and NIST ASD Team (2008).
        NIST Atomic Spectra Database (version 3.1.5), [Online]. Available: http://physics.nist.gov/asd3
        [2010, July 6]. National Institute of Standards and Technology, Gaithersburg, MD
    %theoretical energy levels: Aggarwal, K.M., Hamada, K., Igarashi, A., Jonauskas, V., Keenan, F.P.,
        & Nakazaki, S. 2008, A&A, 487, 388
    %comment:      35699780   Limit
    %comment: theoretical energy levels are taken from the GRASP calculations with QED corrections
    %produced as part of the Arcetri/Cambridge/NRL 'CHIANTI' atomic data base collaboration
    %
    % Enrico Landi - July 2010
     
    

  3. ar_18.wgfa (radiative data)
  4. 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.

     
    %filename: ar_18.wgfa
    %observed energy levels (levels 3,4): Phillips, K.J.H., Sylwester, J., Sylwester, B., Landi, E. 2003, ApJ, 589, L113
    %observed energy levels (all other levels): Ralchenko, Yu., Kramida, A.E., Reader, J., and NIST ASD Team (2008).
        NIST Atomic Spectra Database (version 3.1.5), [Online]. Available: http://physics.nist.gov/asd3
        [2010, July 6]. National Institute of Standards and Technology, Gaithersburg, MD
    %theoretical energy levels: Aggarwal, K.M., Hamada, K., Igarashi, A., Jonauskas, V., Keenan, F.P., Nakazaki, S. 2008, A&A, 487, 388
    % A values (1-2, both decays): Parpia, F.A., Johnson, W.R., 1982, Phys. Rev. A, 26, 1142
    %oscillator strengths and A values: Aggarwal, K.M., Hamada, K., Igarashi, A., Jonauskas, V., Keenan, F.P., Nakazaki, S. 2008, A&A, 487, 388
    %produced as part of the Arcetri/Cambridge/NRL 'CHIANTI' atomic data base collaboration
    %
    % Enrico Landi - July 2010
    

  5. ar_18.scups (electron collision data)
  6. contains the effective electron collision strengths scaled according to the rules formulated by Burgess and Tully (1992).

     
    %filename: ar_18.splups
    %oscillator strengths: Aggarwal, K.M., Hamada, K., Igarashi, A., Jonauskas, V., Keenan, F.P., Nakazaki, S. 2008, A&A, 487, 388
    %effective collision strengths: Aggarwal, K.M., Hamada, K., Igarashi, A., Jonauskas, V., Keenan, F.P., Nakazaki, S. 2008, A&A, 487, 388
    %comment: effective collision strengths are given in the temperature range 5.6 <= log T <= 7.4
    %produced as part of the Arcetri/Cambridge/NRL 'CHIANTI' atomic data base collaboration
    %
    % Enrico Landi - July 2010
    
    

  7. (proton collisional data) Not available in this VERSION.
  8. ar_18.reclvl (total recombination population rates)
  9.  
    %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 - Aug 2006
    


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

    ar_18_table.html (html table)

    Page created by Giulio Del Zanna on Fri Sep 18 13:25:17 2015