Ni XXI - VERSION 5.1

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

• ni_21.elvlc (energy levels)

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

  References:

  %observed energy levels (n=2,3 levels): Shirai,J., Musgrove,A., Wiese,W.L.,2000, J.Phys.Chem.Ref.Data, Monograph 8
  %theoretical energy levels (n=2,3 levels): Bhatia, A.K., Landi, E., unpublished SUPERSTRUCTURE calculation
  %Comment: The SUPERSTRUCTURE calculation included 24 configurations:
                    2s2.2p4, 2s.2p5, 2p6
                    2s2.2p3.3l, 2s.2p4.3l, 2p5.3l     (l=s,p,d)
                    2s2.2p3.4l, 2s.2p4.4l, 2p5.4l     (l=s,p,d,f)
  %produced as part of the Arcetri/Cambridge/NRL 'CHIANTI' atomic data base collaboration
  % 
  % E. Landi - May 2003
  

  
  

• ni_21.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:

  %observed energy levels (n=2,3 levels): Shirai,J., Musgrove,A., Wiese,W.L.,2000, J.Phys.Chem.Ref.Data, Monograph 8
  %theoretical energy levels (n=2,3 levels): Bhatia, A.K., Landi, E., unpublished SUPERSTRUCTURE calculation
  %A values and oscillator strengths: Bhatia, A.K., Landi, E., unpublished SUPERSTRUCTURE calculation
  %Comment: The SUPERSTRUCTURE calculation included 24 configurations:
                    2s2.2p4, 2s.2p5, 2p6
                    2s2.2p3.3l, 2s.2p4.3l, 2p5.3l     (l=s,p,d)
                    2s2.2p3.4l, 2s.2p4.4l, 2p5.4l     (l=s,p,d,f)
  %produced as part of the Arcetri/Cambridge/NRL 'CHIANTI' atomic data base collaboration
  % 
  % E. Landi - May 2003
  

  
  

• ni_21.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: ni_21.splups
  %Oscillator strengths: Bhatia, A.K., Landi, E., Mason, H.E. 2003, ADNDT, 83, 71
  %Collision strengths: Bhatia, A.K., Landi, E., Mason, H.E. 2003, ADNDT, 83, 71
  %produced as part of the Arcetri/Cambridge/NRL 'CHIANTI' atomic data base collaboration
  %
  % E. Landi 2001
  

  
  

• ni_21.psplups (electron collision data)

  contains the spline fits to the scaled proton collision strengths.

  References:

  
  %filename: ni_21.psplups
  %rates: Feldman, U., Doschek, G.A., Cheng, C.C., Bhatia, A.K., 1980, J. Applied Phys., 51, 190
  %energies: Observed energies from CHIANTI .elvlc file
  %comment: Fitted using single_temp.pro with scalx=0.90
  %produced as part of the Arcetri/Cambridge/NRL 'CHIANTI' atomic data base collaboration
  %  
  % Peter Young  12-Mar-02
  

  
  

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

  
  

• ni_21_table.html (html table)