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: http://www.arcetri.astro.it/science/chianti/chianti_4.01/database/he/he_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: Kelly, R. L., 1987, J. Phys. Chem. Ref. Data 16, Suppl. 1. %theoretical energy levels: Aggarwal, K.M., Berrington, K.A., Kingston, A.E., Pathak, A., 1991, J. Phys. B, 24, 1757. %produced as part of the Arcetri/Cambridge/NRL 'CHIANTI' atomic data base collaboration % % K.P.Dere 1995
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: Kelly, R.L., 1987, J.Phys.Chem.Ref.Data 16, Suppl. 1. % A values: Parpia, F.A., Johnson, W.R., 1972, Phys.Rev.A, 26, 1142. %oscillator strengths: Wiese, W.L., Smith, M.W., Glennon, B.M., 1966, Atomic Transition Probabilities, NSRDS-NBS-4. %note: Wiese's oscillator strengths are hydrogenic %produced as part of the Arcetri/Cambridge/NRL 'CHIANTI' atomic data base collaboration % % K.P.Dere 1995
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: he_2.splups %oscillator strengths: Wiese, W.L., Smith, M.W., Glennon, B.M., 1966, Atomic Transition Probabilities, NSRDS-NBS-4 %comment: hydrogenic f values %collision strengths: Aggarwal, K. M., Callaway, J., Kingston, A. E., and Unnikrishnan, K., 1992, ApJS, 80, 473 %collision strengths: Aggarwal, K. M., Berrington, K. A., Kingston, A. E., and Pathak, A., 1991, J. Phys. B, 24, 1757 %collision strengths: Unnikrishnan, K., Callaway, J., and Oza, D. H., 1991, Phys. Rev. A, A43, 5966 %comment: fine structure rates based on LS coupling, for 2p-3p, based on Zhang ratios for lithium-like %comment: the 1s-5l collisions are probably not especially reliable %comment: effective collision strengths were used in the temperature range 3.7 < Log T < 5.0 %produced as part of the Arcetri/Cambridge/NRL 'CHIANTI' atomic data base collaboration % % K.P.Dere 1994