Ar XVIII - VERSION 5.1

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

• ar_18.elvlc (energy levels)

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

  References:

  %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
  

  
  

• ar_18.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:

  % 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
  

  
  

• ar_18.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_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
  

  
  

• ar_18.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_18_table.html (html table)