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

mg_2.elvlc (energy levels)

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

 
%observed energies: NIST Atomic Spectra Database, version 3.1.3
%theoretical energies: Sigut, T.A.A., & Pradhan, A.K., 1995, J.Phys.B, 28, 4879
% produced as part of the Arcetri/Cambridge/NRL 'CHIANTI' atomic data base collaboration
%
%   P.R. Young - 26-Nov-2007
 

mg_2.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: mg_2.wgfa
%observed energies: NIST Atomic Spectra Database, version 3.1.3
%theoretical energies: Sigut, T.A.A., & Pradhan, A.K., 1995, J.Phys.B, 28, 4879
%A-values (all transitions except those involving level 9): Froese Fischer, C., 2002 
     (data available from http://www.vuse.vanderbilt.edu/~cff/mchf_collection.html)
%A-values (transitions involving level 9): the A-values are derived from the oscillator strengths 
     given in Table 3 of: Sigut, T.A.A., & Pradhan, A.K., 1995, J.Phys.B, 28, 4879
Comments: Froese Fischer only gives data for levels up to and including n=4.  
     The Sigut & Pradhan oscillator strengths are given for the 3p-5s and 
     4p-5s transitions. They've been split according to statistical weights
     and converted to A-values using observed energy levels.
% produced as part of the Arcetri/Cambridge/NRL 'CHIANTI' atomic data base collaboration
%
%     Peter Young - 26-Nov-2007

mg_2.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: mg_2.splups
%oscillator strengths (all transitions except those involving level 9): Froese Fischer, C., 2002
     (data available from http://www.vuse.vanderbilt.edu/~cff/mchf_collection.html)
%oscillator strengths (transitions involving level 9): from Table 3 of: Sigut, T.A.A., & Pradhan, A.K., 1995, J.Phys.B, 28, 4879
%effective collision strengths: Sigut, T.A.A., & Pradhan, A.K., 1995, J.Phys.B, 28, 4879
%comment: The original upsilons are tabulated for six temperatures over the temperature range 1000 - 30,000 K.
% produced as part of the Arcetri/Cambridge/NRL 'CHIANTI' atomic data base collaboration
%
%     Peter Young - 26-Nov-2007

mg_2.splups (proton collisional data) Not available in this VERSION.

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

mg_2_table.html (html table)


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