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The CHIANTI database consists of the following primary ASCII files for this ion:
contains the energy levels in cm^(-1) It includes both experimental and theoretical values of the levels energies.
%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
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.
%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
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: 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