N IV - VERSION 8.0


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

  1. n_4.elvlc (energy levels)
  2. contains the energy levels (in cm-1). It includes both experimental and theoretical values of the levels energies.

     
    %filename: n_4.elvlc
    %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.
    %Theoretical energy levels: Ramsbottom, C.A., Berrington, K.A., Hibbert, A., Bell, K.L.,
       Pyhs.Scripta, 1994, 50, 246
    %produced as part of the Arcetri/Cambridge/NRL 'CHIANTI' atomic data base collaboration
    %
    % Enrico Landi 1996
     
    

  3. n_4.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: n_4.elvlc
    %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.
    %A-values: Tachiev, G. & Froese Fischer, C., 1999, J.Phys.B, 32, 5805
    %A-values (transition 1-9): Kingston, A.E., Hibbert, A., 2001, J.Phys.B, 34, 81
    %A-values (transitions 5-13, 8-13, 4-14, 3-15, 4-15, 2-16, 3-16, 4-16): P.R. Young, 9-Jun-2006, calculation with SSTRUCT.
    %comment: The Tachiev & Froese Fischer calculation did not cover all transtions
       for N IV, and so they have been supplemented with data from Kingston & Hibbert 
       and P.R. Young.  
       The SSTRUCT calculation used a 17 configuration model of the ion, and
       term energy corrections were applied. Observed energies were used in the
       calculation of the A-values.
    % produced as part of the Arcetri/Cambridge/NRL 'CHIANTI' atomic data base collaboration
    %
    % Peter Young - 12-Jun-2006
    

  5. n_4.scups (electron collision data)
  6. contains the effective electron collision strengths scaled according to the rules formulated by Burgess and Tully (1992).

     
    %filename: n_4.splups
    %oscillator strengths: SUPERSTRUCTURE calculations by P.R.Young
    %effective collision strengths: Ramsbottom, C.A., Berrington, K.A., Hibbert, A., Bell, K.L., Pyhs.Scripta, 1994, 50, 246
    %comment: The transitions between levels 1-4 and levels 2-10 have been re-fit
    using 9 point splines to better reproduce the low temperature behaviour.
    These fits are accurate to < 1.22 % over the range 3.1 < log T < 5.6
    All remaining fits are valid over the range 4.0 < Log T < 6.0.
    % Comment: updated with 9 point spline fits (PRY 12-Jun 2006)
    % produced as part of the Arcetri/Cambridge/NRL 'CHIANTI' atomic data base collaboration
    %
    % Peter Young and Enrico Landi - 12-Jun-2006
    
    

  7. n_4.psplups (proton collision data)
  8. contains the spline fits to the scaled proton collision strengths.

     
    
    %filename: n_4.psplups
    %rates: Ryans R.S.I., Foster-Woods V.J, Copeland F., Keenan F.P., Matthews A., Reid R.H.G., 1998, ADNDT 70, 179-229
    %energies: Wiese W.L., Fuhr J.R., Deters T.M., 1996, J. Phys. Chem. Ref. Data, Monograph #7
    %comment: Fits valid for temperatures 4e4 to 3e6 K.
    %produced as part of the Arcetri/Cambridge/NRL 'CHIANTI' atomic data base collaboration
    %
    % Peter Young  23-Mar-01
    


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

    n_4_table.html (html table)

    Page created by Giulio Del Zanna on Fri Sep 18 13:28:35 2015