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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.
%energy levels (n=2): Edlen, B., 1985, Physica Scripta, 31, 345 %energy levels (n=3): 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: Bhatia, A.K., Doschek, G.A., 1993, ADNDT, 55, 281 % produced as part of the Arcetri/Cambridge/NRL 'CHIANTI' atomic data base collaboration % % E.Landi 2000
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: si_9.wgfa
%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: Bhatia, A.K., Doschek, G.A., 1993, ADNDT, 55, 281
%A-values (ground configuration): Galavis, M.E., Mendoza, C., Zeippen, C.J., 1997, A&AS, 123, 159
%A values and oscillator strengths: Bhatia, A.K., Doschek, G.A., 1993, ADNDT, 55, 281
%produced as part of the Arcetri/Cambridge/NRL 'CHIANTI' atomic data base collaboration
%
% E.Landi and P.R. Young - 17-Jul-2006
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: si_9.splups %oscillator strengths: Bhatia, A.K., Doschek, G.A., 1993, ADNDT, 55, 281 %collision strengths: Bhatia, A.K., Doschek, G.A., 1993, ADNDT, 55, 281 %effective collision strengths (ground configuration): Aggarwal, K.M., 1983, J.Phys.B, 16, L59 %comment: Relativistic effects are not included in the Aggarwal calculations, but he does a comparison with the DW calcs of Mason & Bhatia (MNRAS 184, 423, 1978) and finds good agreement. A comparison with the more recent Iron Project data of Lennon & Burke (AAS 103, 273, 1994) also shows good agreement. %comment: As Aggarwal did not present calculated energies, observed values have been used. %comment: effective collision strengths were provided in the temperature range 5.5 < Log T < 6.4 %produced as part of the Arcetri/Cambridge/NRL 'CHIANTI' atomic data base collaboration % % Enrico Landi and Peter Young, Nov 2002
contains the spline fits to the scaled proton collision strengths.
%filename: si_9.psplups %rates: Ryans R.S.I., Foster-Woods V.J, Keenan F.P., Reid R.H.G., 1999, ADNDT 73, 1-42 %energies: CHIANTI database, ver.1, Dere et al., A&AS 125, 149, 1997 %comment: Fits valid for temperatures 2e5 to 3e7 K. %produced as part of the Arcetri/Cambridge/NRL 'CHIANTI' atomic data base collaboration % % Peter Young 10-Sep-2002