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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.
%observed energy levels: Johansson L., Magnusson C.E., Joelsson I., Zetterberg P.O., Physica Scripta 46, 221, 1992
%theoretical energy levels: Tayal S.S., Gupta G.P., ApJ 526, 544, 1999
%comment Level ordering is from Tayal & Gupta.
%comment: Note that Tayal & Gupta do not include the 3F and 1F terms from the
3p.4d configuration in their S III model.
%Produced as part of the Arcetri/Cambridge/NRL 'CHIANTI' atomic data base collaboration
%
% P.R. Young, Dec-99
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: s_3.wgfa
%observed energy levels: Johansson L., Magnusson C.E., Joelsson I., Zetterberg P.O., Physica Scripta 46, 221, 1992
%theoretical energy levels: Tayal S.S., Gupta G.P., ApJ 526, 544, 1999
%A-values and gf-values (levels 1-41): Froese Fischer, C., Tachiev, G., & Irimia, A. 2006, ADNDT, 92, 607
%A-values (transitions involving level 16): P.R. Young, 2000, unpublished Superstructure calculation
%A-values and gf-values (transitions involving 4d configuration): Tayal S.S., 1997, ADNDT 67, 331
%comment: Level 16 is metastable, and E2, M1 and M2 transition probabilities were calculated using
SUPERSTRUCTURE. For the model of the ion, the six configurations of the CHIANTI model were included
%comment: The wavelengths are not those given in Table III of Tayal as these are slightly different from
the observed ones. The gf and A-values were not scaled by the ratio of observed and theoretical wavelengths.
%Produced as part of the Arcetri/Cambridge/NRL 'CHIANTI' atomic data base collaboration
%
% P.R. Young and E. Landi - May 2009
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: s_3.splups %oscillator strengths: Tayal S.S., 1997, ADNDT 67, 331 %effective collision strengths: Tayal S.S., Gupta R.P., 1999, ApJ, 526, 544 %comment: effective collision strengths were used in the temperature range 4.3 < Log T < 5.0 %comment: The three low temperature points for the transitions up to levels 42 to 49 are unreliable (Tayal, private communication) and so only the five highest temperature points for these transitions were fitted. %produced as part of the Arcetri/Cambridge/NRL 'CHIANTI' atomic data base collaboration % % Peter Young, May 2000