Si II - VERSION 11.0

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

si_2.elvlc (energy levels)

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

 
%filename: si_2.elvlc
%observed energies: v.3 of the NIST Atomic Database
%theoretical energies: Tayal, 2008, ApJS, 179, 534
% produced as part of the Arcetri/Cambridge/NRL 'CHIANTI' atomic data base collaboration
%
%     Peter Young, Jan-2009

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_2.wgfa
%observed energies: v.3 of the NIST Atomic Database
%theoretical energies: Tayal, 2008, ApJS, 179, 534
%A-values: Tayal, S.S., 2007, J.Phys.B, 40, 2551
%A-values: Nahar, S.N., 1998, ADNDT 68, 183
%A-values: Nussbaumer, H. 1977, A&A, 58, 291
%Comment: Both Nahar (1998) and Tayal (2007) give f-values so these have been converted to
    A-values using the observed energies.
    All data from Tayal (2007) have been used and these have been supplemented with
    Nahar (1998) for all remaining allowed transitions, and Nussbaumer (1977) for the
    ground transition.
% produced as part of the Arcetri/Cambridge/NRL 'CHIANTI' atomic data base collaboration
%
%  Peter Young, Jan-2009
%File processed with wgfa_tidy by pryoung on  6-Mar-2019
%File processed with wgfa_tidy by pryoung on 31-May-2023

si_2.scups (electron collision data)

contains the effective electron collision strengths scaled according to the rules formulated by Burgess and Tully (1992).

 
%  Peter Young, Feb-2009                                                                
%                                                                                       
% produced as part of the Arcetri/Cambridge/NRL 'CHIANTI' atomic data base collaboration
%Effective collision strengths:  Tayal, S.S., 2008, ApJS, 179, 534                      
%gf-values:  Tayal, S.S., 2007, J.Phys.B, 40, 2551 and Nahar, S.N., 1998, ADNDT 68, 183 
%theoretical energies: Tayal, S.S., 2008, ApJS, 179, 534                                
%filename: si_2.splups

si_2.psplups (proton collision data)

contains the spline fits to the scaled proton collision strengths.

 

%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

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

si_2_table.html (html table)