The CHIANTI database has 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.
%filename: ar_4.elvlc %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.
%filename: ar_4.wgfa %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 minimum branching ratio = 1.00e-05 - K Dere : 2017 December 16 %File processed with wgfa_tidy by pryoung on 6-Mar-2019 %File processed with wgfa_tidy by pryoung on 31-May-2023
contains the effective electron collision strengths scaled according to the rules formulated by Burgess and Tully (1992).
% Enrico Landi - Jun 2003 % % produced as part of the Arcetri/Cambridge/NRL 'CHIANTI' atomic data base collaboration They slightly affect the population balance at electron densities > 10^12 cm^-3. %Comment: correction (June 2003): added collisional transitions including levels 17 and 25. %Comment: the collisional data are provided in the temperature range 3.0 < Log T < 6.0 Radiative data have been calculated using experimental energy values. 3p4.4l with l=s,p,d,f 3s.3p3.4l with l=s,p,d,f 3s2.3p3.4l with l=s,p,d,f 3p2.3d3, 3p3.3d2, 3p4.3d, 3p5 3s.3p4, 3s.3p3.3d, 3s.3p2.3d2, 3s.3p.3d3 3s2.3p3, 3s2.3p2.3d, 3s2.3p.3d2, 3s2.3d3 % Comment: the configurations included in the SUPERSTRUCTURE calculation are: %Effective collision strengths other configurations: Ramsbottom & Bell, 1997, 66, 65 %Effective collision strengths ground configuration: Ramsbottom et al 1997, MNRAS, 284, 754 %Oscillator strengths: SUPERSTRUCTURE calculation, including 25 configurations. %filename: ar_4.splups
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