The CHIANTI database consists of the following primary ASCII files for this ion:

si_7.elvlc (energy levels)

contains the energy levels in cm^(-1) It includes both experimental and theoretical values of the levels energies.

 
%observed energy levels (n=2): Edlen, B. 1983, Physica Scripta, 28, 51
%observed energy levels (12,19,23-26,65-67,69,70,72-74,78-82,84,85): Fuhr, J.R., et al.,
    "NIST Atomic Spectra Database" ver. 2.0 March 1999. NIST Physical Reference Data
%observed energy levels (16-18,20,21,29,31-34,40-42,46,48,52,55,57,59,62,63): Kink, I., Jupen, C.,
     Engstroem, L., Feldman, U., Laming, J.M., Schuehle, U., 1997, ApJ, 487, 956
%observed energy levels (11,13-15,22,28,30,35-37,43-45,47,49-51,53,54,56,60,61,64,68,71,75-77,86):
     Kink, I., Engstroem, L., 1997, Physica Scripta, 56, 31
%theoretical energy levels: From the 24-configuration model by Bhatia, A.K., Landi, E., 2003, ApJ, 585, 587
% Comment: The observed energy of level 11 is in reality theoretical. It has been inserted so that
           energies of levels 16,17,18 could be determined from its value and the experimental
           energy difference measured by Kink et al 1997 from transitions involving each of these levels
           with level 11. The energy of levels 40,41,42 has then been determined from the energy difference
           measured by Kink  et al 1997 for the transitions between levels 16-18 and 40-42.
           This means that the absolute energies of levels 16,17,18,40,41,42 are probably offset by
           a constant value, but their energy difference is experimentally correct. This allows
           CHIANTI to correctly calculate the transition wavelengths from these levels, to reproduce
           lines observed by SUMER in solar active and quiet spectra.
% produced as part of the Arcetri/Cambridge/NRL 'CHIANTI' atomic data base collaboration
%
%  E. Landi - Jan 2009
 

si_7.wgfa (radiative data)

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_7.wgfa
%observed energy levels (n=2): Edlen, B. 1983, Physica Scripta, 28, 51
%observed energy levels (12,19,23-26,65-67,69,70,72-74,78-82,84,85): Fuhr, J.R., et al.,
    "NIST Atomic Spectra Database" ver. 2.0 March 1999. NIST Physical Reference Data
%observed energy levels (16-18,20,21,29,31-34,40-42,46,48,52,55,57,59,62,63): Kink, I., Jupen, C.,
     Engstroem, L., Feldman, U., Laming, J.M., Schuehle, U., 1997, ApJ, 487, 956
%observed energy levels (11,13-15,22,28,30,35-37,43-45,47,49-51,53,54,56,60,61,64,68,71,75-77,86):
     Kink, I., Engstroem, L., 1997, Physica Scripta, 56, 31
%theoretical energy levels: From the 24-configuration model by Bhatia, A.K., Landi, E., 2003, ApJ, 585, 587
%Radiative data: From the 24-configuration model by Bhatia, A.K., Landi, E., 2003, ApJ, 585, 587
%Radiative data transition within the ground configuration: Tachiev, G.I., Froese Fischer, C., 2002, A&A, 385, 716
%Radiative data 3-4 and 4-5 transitions: Froese Fischer, C., Saha, H.P., 1983, Phys. Rev. A., 28, 3169
% produced as part of the Arcetri/Cambridge/NRL 'CHIANTI' atomic data base collaboration
%
%  E. Landi - Jan 2009

si_7.splups (electron collision data)

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_7.splups
%oscillator strengths: Bhatia, A.K., Landi, E., 2003, ApJ, 585, 587
%collision strengths: Bhatia, A.K., Landi, E., 2003, ApJ, 585, 587
% produced as part of the Arcetri/Cambridge/NRL 'CHIANTI' atomic data base collaboration
%
%  E. Landi - Oct 2002

si_7.psplups (proton collision data)

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

---

The html table below contains the radiative data of the brightest lines sorted in wavelength

si_7_table.html (html table)


Last revised by G. Del Zanna on 4-Sep-2009