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

fe_18.elvlc (energy levels)

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

 
%Observed energy levels (levels 2,3): Shirai,T., Sugar,J., Musgrove,A., Wiese,W.L., 2000, J.Phys.Chem.Ref.Data, Monograph 8
%Observed energy levels: from the line list of Landi & Phillips 2005, ApJ, in press
%observed energy levels (above ionization): Palmeri P., Mendoza C., Kallman T.R., Bautista M.A., 2003, A&A, 403, 1175
%Theoretical energy levels (below ionization): Landi & Gu, 2005, ApJ, in press
%produced as part of the Arcetri/Cambridge/NRL 'CHIANTI' atomic data base collaboration
%
% Enrico Landi - Mar 2005
 

fe_18.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.

 
%Observed energy levels (levels 2,3): Shirai,T., Sugar,J., Musgrove,A., Wiese,W.L., 2000, J.Phys.Chem.Ref.Data, Monograph 8
%Observed energy levels: from the line list of Phillips & Landi 2005, ApJ, in press
%Observed energy levels (above ionization): Palmeri P., Mendoza C., Kallman T.R., Bautista M.A., 2003, A&A, 403, 1175
%Theoretical energy levels: Landi & Gu 2005, ApJ, in press
%Radiative data (below ionization): Landi & Gu 2005, ApJ, in press
%Radiative data (above ionization): Palmeri P., Mendoza C., Kallman T.R., Bautista M.A., 2003, A&A, 403, 1175
%Autoionization rate: Palmeri P., Mendoza C., Kallman T.R., Bautista M.A., 2003, A&A, 403, 1175
%produced as part of the Arcetri/Cambridge/NRL 'CHIANTI' atomic data base collaboration
%
% Enrico Landi - Mar 2005

fe_18.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: fe_18.splups
%oscillator strengths: Landi & Gu 2005, ApJ, in press
%oscillator strengths (above ionization): Bautista, M.A., Mendoza, C., Kallman, T.R., Palmeri, P., 2004, A&A, 418, 1171
%Effective collision strengths 1-2 transition: Berrington, K.A., Saraph, H.E., Tully, J.A., 1998, A&AS 129, 161
%Effective collision strengths (n=2,3 levels): Gu, M.F., 2003, ApJ, 582, 1241
%Collision strengths (levels 3-336): Landi & Gu 2005, ApJ, in press
%Effective collision strengths (above ionization): Bautista, M.A., Mendoza, C., Kallman, T.R., Palmeri, P., 2004, A&A, 418, 1171
%comment: effective collision strengths for the 1-2 transition are given in the range 3.24e5 < T < 3.24e7
%comment: effective collision strengths for n=2,3 levels are given in the range 1.16e6 < T < 5.8e7
%comment: effective collision strengths for levels above ionization are given in the range 6.46e4 < T < 1.62e7
%produced as part of the Arcetri/Cambridge/NRL 'CHIANTI' atomic data base collaboration
%
%  Enrico Landi - Mar 2005

fe_18.psplups (proton collision data)

contains the spline fits to the scaled proton collision strengths.

 

%filename: fe_18.psplups
%rates: Foster V.J, Keenan F.P., Reid R.H.G., 1994, Phys. Rev. A 49, 3092-3095
%energies: Reader J., Sugar J., 1975, J.Phys.Chem.Ref.Data 4, 353
%comment: Fit valid for temperatures 2e6 to 2.5e8 K.
%produced as part of the Arcetri/Cambridge/NRL 'CHIANTI' atomic data base collaboration
%
% Peter Young   16-May-2001

fe_18.reclvl (total recombination population rates)

 
%filename: fe_18.rec
%Total recombination population rate: Gu, M.F., 2003, ApJ, 582, 1241
%produced as part of the Arcetri/Cambridge/NRL CHIANTI atomic data base collaboration
%
% Enrico Landi - Feb 2004

fe_18.cilvl (collisional ionization population rates)

 
%filename: fe_18.ci
%Collisional ionization population rate: Gu, M.F., 2003, ApJ, 582, 1241
%produced as part of the Arcetri/Cambridge/NRL CHIANTI atomic data base collaboration
%
% Enrico Landi - Feb 2004

---

The html tables below contain the radiative data of the brightest lines sorted in wavelength

fe_18_table1.html (html table -- 10.1637 -- 16.0913 A)

fe_18_table2.html (html table -- 16.1358 -- 974.8602 A)


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