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.
Theoretical energies: Mao, J., Badnell, N. R., Del Zanna, G. A&A, 653, A81 "R-matrix electron-impact excitation data for the O-like iso-electronic sequence" DOI: 10.1051/0004-6361/202141464 Note: only bound levels have been retained. Observed energies: Levels 2,3 and 6-8: Young, P.R., 2023, ApJ, 958, 40 Other energies: the version 10 energies for the lowest states have been retained: Edlen, B. 1983, Physica Scripta, 28, 51 Kink, I., Jupen, C., Engstroem, L., Feldman, U., Laming, J.M., Schuehle, U., 1997, ApJ, 487, 956 Kink, I., Engstroem, L., 1997, Physica Scripta, 56, 31 for the other states energies are from NIST Atomic Spectra Database,[Online]. https://physics.nist.gov/PhysRefData/ASD/levels_form.html Produced as part of the 'CHIANTI' atomic data base collaboration by Giulio Del Zanna, Mar 2023 7-Mar-2024, Peter Young: updated energies for levels 2,3 and 6-8. -1
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.
gf-values, A-values and theoretical energies: Mao, J., Badnell, N. R., Del Zanna, G., 2021, A&A, 653, A81 "R-matrix electron-impact excitation data for the O-like iso-electronic sequence" DOI: 10.1051/0004-6361/202141464 Note: only bound levels have been retained. Only transition probabilities with a branching ratio greater than 10^(-5) have been retained. gf-values, A-values for the lowest 10 levels: Tachiev, G.I. and Froese Fischer, C., A&A, 2002,385,716 MCHF calculations doi = 10.1051/0004-6361:20011816 Observed energies: Levels 2,3 and 6-8: Young, P.R., 2023, ApJ, 958, 40 Other energies: the version 10 energies for the lowest states have been retained: Edlen, B. 1983, Physica Scripta, 28, 51 Kink, I., Jupen, C., Engstroem, L., Feldman, U., Laming, J.M., Schuehle, U., 1997, ApJ, 487, 956 Kink, I., Engstroem, L., 1997, Physica Scripta, 56, 31 for the other states energies are from NIST Atomic Spectra Database,[Online]. https://physics.nist.gov/PhysRefData/ASD/levels_form.html Produced as part of the 'CHIANTI' atomic data base collaboration by Giulio Del Zanna, Mar 2023 7-Mar-2024: updated wavelengths following change to elvlc file.
contains the effective electron collision strengths scaled according to the rules formulated by Burgess and Tully (1992).
Giulio Del Zanna, Mar 2023 Produced as part of the 'CHIANTI' atomic data base collaboration by Note: only bound levels have been retained. DOI: 10.1051/0004-6361/202141464 "R-matrix electron-impact excitation data for the O-like iso-electronic sequence" Mao, J., Badnell, N. R., Del Zanna, G., 2021, A&A, 653, A81 oscillator strengths and effective collision strengths:
contains the spline fits to the scaled proton collision strengths.
%file: si_7.psplups %rates: Ryans R.S.I., Keenan F.P., Reid R.H.G., unpublished. %energies: Observed values, from .elvlc file %comment: Fits valid for temperatures 1.75e5 to 6e6 K. %produced as part of the Arcetri/Cambridge/NRL 'CHIANTI' atomic data base collaboration % % Peter Young 15-May-2001
Page created by Giulio Del Zanna on Tue Dec 3 13:25:14 2024