Ar IV - VERSION 5.1

The CHIANTI database consists of 4 primary ASCII files for each ion in the database.

• ar_4.elvlc (energy levels)

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

  References:

  %experimental energy levels: Fuhr, J.R., Kelleher, D.E., Martin, W.C., Musgrove, A., Sugar, J., Wiese, W.L.,
          Dalton, G.R., Dragoset, R.A., Mohr, P.J., Olsen, K., Reader, J., Saloman, E.B., Sansonetti, C.J.,
          Wiersma, G., "NIST Atomic Spectra Database" Ver. 2.0, March 1999, NIST Physical Reference Data.
  % Theoretical energy levels: Ramsbottom et al 1997, MNRAS, 284, 754
  %produced as part of the Arcetri/Cambridge/NRL 'CHIANTI' atomic data base collaboration
  %
  % E.Landi - Aug 2001
  

  
  

• ar_4.wgfa (radiative data)

  contains wavelengths, gf and A values for each transition. Wavelengths are based on experimental level energies where available; wavelengths calculated from theoretical energies are less accurate and are given as negative values.

  References:

  %experimental energy levels: Fuhr, J.R., et al., "NIST Atomic Spectra Database" Ver. 2.0, 
        March 1999, NIST Physical Reference Data.
  % Theoretical energy levels: Ramsbottom et al 1997, MNRAS, 284, 754
  % Radiative data: SUPERSTRUCTURE calculation, including 25 configurations.
  % Comment: the configurations included in the SUPERSTRUCTURE calculation are:
  
             3s2.3p3, 3s2.3p2.3d, 3s2.3p.3d2, 3s2.3d3
             3s.3p4, 3s.3p3.3d, 3s.3p2.3d2, 3s.3p.3d3
             3p2.3d3, 3p3.3d2, 3p4.3d, 3p5
             3s2.3p3.4l with l=s,p,d,f
             3s.3p3.4l  with l=s,p,d,f
             3p4.4l     with l=s,p,d,f
  
             Radiative data have been calculated using experimental energy values.
  
  %produced as part of the Arcetri/Cambridge/NRL 'CHIANTI' atomic data base collaboration
  % 
  % Enrico Landi - Aug 2001
  

  
  

• ar_4.splups (electron collision data)

  contains the spline fits to the electron collision strengths scaled according to 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.

  References:

  
  %filename: ar_4.splups
  %Oscillator strengths: SUPERSTRUCTURE calculation, including 25 configurations.
  %Effective collision strengths ground configuration: Ramsbottom et al 1997, MNRAS, 284, 754
  %Effective collision strengths other configurations: Ramsbottom & Bell, 1997, 66, 65
  % Comment: the configurations included in the SUPERSTRUCTURE calculation are:
  
             3s2.3p3, 3s2.3p2.3d, 3s2.3p.3d2, 3s2.3d3
             3s.3p4, 3s.3p3.3d, 3s.3p2.3d2, 3s.3p.3d3
             3p2.3d3, 3p3.3d2, 3p4.3d, 3p5
             3s2.3p3.4l with l=s,p,d,f
             3s.3p3.4l  with l=s,p,d,f
             3p4.4l     with l=s,p,d,f
  
             Radiative data have been calculated using experimental energy values.
  
  %Comment: the collisional data are provided in the temperature range 3.0 < Log T < 6.0
  %Comment: correction (June 2003): added collisional transitions including levels 17 and 25.
            They slightly affect the population balance at electron densities > 10^12 cm^-3.
  % produced as part of the Arcetri/Cambridge/NRL 'CHIANTI' atomic data base collaboration
  %
  % Enrico Landi - Jun 2003
  

  
  

• ar_4.psplups (electron collision data) - Not Present in CHIANTI 5.1

  contains the spline fits to the scaled proton collision strengths.
  

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

  
  

• ar_4_table.html (html table)