Mg VIII - VERSION 5.0

The CHIANTI database consists of 4 primary ASCII files for each ion in the database.

• mg_8.elvlc (energy levels)

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

  References:

  %observed energy levels (n=2): Edlen, B, 1983, Phys. Scripta, 28, 483
  %observed energy levels (n=3): Martin,W.C., Zalubas,R., 1980, J.Phys.Chem.Ref.Data, 9, 1.      
  %theoretical energy levels (n=2): Zhang,H.L., Graziani,M., Pradhan,A.K., 1994, A&A, 283, 319.
  %theoretical energy levels (n=3): Sampson and Zhang, 1995, unpublished calculations
  %comment:  energy levels renumbered                                          
  %produced as part of the Arcetri/Cambridge/NRL 'CHIANTI' atomic data collaboration
  %
  % K.P.Dere and E.Landi 1999
  

  
  

• mg_8.wgfa (radiative data)

  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 (n=2): Edlen, B, 1983, Phys. Scripta, 28, 483
  %observed energy levels (n=3): Martin, W.C., Zalubas, R., 1980, J.Phys.Chem.Ref.Data, 9, 1.
  %oscillator strengths: Dankwort,W., Trefftz,E., 1978, A&A, 65, 93.
  %oscillator strengths: Bhatia,A.K., Feldman,U., Seely,J.F., 1986, ADNDT, 35, 319.
  %oscillator strengths (16- 125): Sampson and Zhang, 1995, unpublished calculations
  %note:  gf and A values for transitions 123-71 and 124-72 are estimates
  % produced as part of the Arcetri/Cambridge/NRL 'CHIANTI' atomic data base collaboration
  %
  % K.P.Dere and E.Landi 1999
  

  
  

• mg_8.splups (electron collision data)

  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: mg_8.splups
  %oscillator strengths: Dankwort,W., Trefftz,E., 1978, A&A, 65, 93.
  %oscillator strengths: Bhatia,A.K., Feldman,U., Seely,J.F., 1986, ADNDT, 35, 319
  %oscillator strengths (16 - 125): Sampson and Zhang, 1995, unpublished calculations
  %effective collision strengths (1 - 15): Zhang, H.L., Graziani, M., Pradhan, A.K., 1994, A&A, 283, 319
  %collision strengths (16 - 125): Sampson and Zhang, 1995, unpublished calculations
  %comment: effective collision strengths were provided in the temperature range 3.7 < Log T < 6.4
  % produced as part of the Arcetri/Cambridge/NRL 'CHIANTI' atomic data base collaboration
  %
  %  K.P. Dere 1995
  

  
  

• mg_8.psplups (electron collision data)

  contains the spline fits to the scaled proton collision strengths.

  References:

  
  %filename: mg_8.psplups
  %rates: Foster VJ, Keenan FP, Reid RHG, ADNDT 67, 99, 1997
  %energies: From .elvlc file, experimental energies
  %comment: The rate coefficients are in units cm^3/s.
  %comment: Fits valid for temperatures 1e5 to 2.5e6 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

  
  

• mg_8_table1.html (html table -- part 1)

• mg_8_table2.html (html table -- part 2)