Si VII - VERSION 11.0.1

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

  1. si_7.elvlc (energy levels)

    2. 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

  2. si_7.wgfa (radiative data)

    3. 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.

  3. si_7.scups (electron collision data)

    4. 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:

  4. si_7.psplups (proton collision data)

    5. 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 tables below contain the radiative data of the brightest lines sorted in wavelength

    Page created by Giulio Del Zanna on Wed Apr 16 17:44:32 2025