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: http://www.arcetri.astro.it/science/chianti/chianti_5.1/database/si/si_2.html
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The CHIANTI database consists of 4 primary ASCII files for each ion in the database.
contains the energy levels in cm^(-1) It includes both experimental data and theoretical values of the levels energies.
References:
%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: P.R.Young (DAMTP, Un. of Cambridge, UK), SUPERSTRUCTURE calculations, 1996 % produced as part of the Arcetri/Cambridge/NRL 'CHIANTI' atomic data base collaboration % % E. Landi 1996
contains wavelengths, gf and A values for each transition. Wavelengths are based on experimental level energies where available; wavelengths calculated from theoretical energies are less accurate and are given as negative values.
References:
%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 %A-values, gf-values: Nahar S.N., 1998, ADNDT 68, 183 %A-values, gf-values: Nussbaumer H., 1977, A&A 58, 291 %comment: The Nussbaumer A-values are used for the transitions between levels 1 to 5, i.e., the forbidden and intercombination transitions. Nahar did not calculate A-values for these transitions. Nahar only gave gf values. These were converted to A-values by using the experimental energy separation. Table A of Nahar gives a useful comparison of his gf values with those from previous calculations and experiment. %comment: correction on 11-Jun-03, Peter Young The 1-3 A-value was incorrectly listed as 4.550E-03. The correct value of 4.550E+03 has now been inserted. It affects line at 2335 A (Error spotted by Sergei Lamzin.) % produced as part of the Arcetri/Cambridge/NRL 'CHIANTI' atomic data base collaboration % % P.R.Young - Jun 2003
contains the spline fits to the electron collision strengths scaled according to 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.
References:
%filename: si_2.splups %oscillator strengths: Nahar S.N., 1998, ADNDT 68, 183 %oscillator strengths: Nussbaumer H., 1977, A&A 58, 291 %effective collision strengths: Dufton,P.L., Kingston,A.E., 1991, MNRAS, 248, 827 %comment: effective collision strengths were provided in the temperature range 3.6 < Log T < 4.6 %produced as part of the Arcetri/Cambridge/NRL 'CHIANTI' atomic data base collaboration % % Enrico Landi - 1996
contains the spline fits to the scaled proton collision strengths.
References:
%filename: si_2.psplups %rates: Bely, O., Faucher, P., 1970, A&A 6, 88 %energies: Observed energies from .elvlc file. %produced as part of the Arcetri/Cambridge/NRL 'CHIANTI' atomic data base collaboration % % Peter Young 8-Jun-2001