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

ni_25.elvlc (energy levels)

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

 
%observed 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: Sampson, D.H., Goett, S.J., Clark, R.E.H., 1984, ADNDT, 30, 125
%comment: the NIST energy levels values for 2p3p 1P1 and 3D1 (E3 and E4) have been reversed
    to match the energy level ordering of Sampson et al and give a better agreement to the 
    theoretical values of Sampson. Sampson's calculations also note the two levels are nearly 
    equally mixed around Z=17 to 18.
%produced as part of the Arcetri/Cambridge/NRL 'CHIANTI' atomic data base collaboration
%
% K.P.Dere 1995
 

ni_25.wgfa (radiative data)

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.

 
%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 (n=3): Sampson, D.H., Goett, S.J., Clark, R.E.H., 1984, ADNDT, 30, 125
%oscillator strengths: allowed transitions: Zhang, H., Sampson, D.H., 1992, ADNDT, 52, 43
%oscillator strengths: forbidden transitions: Muhlethaler and Nussbaumer, 1976, A&A, 48, 109
%comment: gf values for transitions 19-26 and 23-26 were simply taken to be
   equal to the O V gf values reported by Hibbert, 1980, J. Phys. B, 13, 1721.
   The A values were obtained from the gf values by using the wavelengths listed.
%produced as part of the Arcetri/Cambridge/NRL 'CHIANTI' atomic data base collaboration
%
% E. Landi (n=2) and  K.P. Dere (n=3)  Jul 97

ni_25.splups (electron collision data)

contains the spline fits to the electron collision strengths scaled according the rules formulated by 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.

 

%filename: ni_25.splups
%oscillator strengths (n=3): Sampson, D.H., Goett, S.J., Clark, R.E.H., 1984, ADNDT, 30, 125
%oscillator strengths (n=2): Zhang, H., Sampson, D.H., 1992, ADNDT, 52, 43
%collision strengths (n=2): Zhang, Sampson, 1992, ADNDT, 52, 143
%collision strengths (n=3): Sampson, D.H., Goett, S.J., Clark, R.E.H., 1984, ADNDT, 30, 125
%produced as part of the Arcetri/Cambridge/NRL 'CHIANTI' atomic data base collaboration
%
% B.Monsignori Fossi 1995 (n=2);  K.P. Dere 7/97  (n=3)

ni_25.psplups (proton collision data)

contains the spline fits to the scaled proton collision strengths.

 

%filename: ni_25.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: Bhatia A.K., Feldman U., Seely J.F., 1986, ADNDT 35, 449-472
%comment: Fits valid for temperatures 5e6 to 7.5e8 K.
%produced as part of the Arcetri/Cambridge/NRL 'CHIANTI' atomic data base collaboration
%
% Peter Young  24-Oct-00

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

ni_25_table.html (html table)


Last revised by G. Del Zanna on 4-Sep-2009