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The CHIANTI database consists of the following primary ASCII files for this ion:
contains the energy levels in cm^(-1) It includes both experimental and theoretical values of the levels energies.
%observed energy levels: NIST Database for Atomic Spectroscopy, Version 1.0, NIST Standard Reference Database 61, 1995 %theoretical energy levels: Fawcett & Mason, ADNDT 47, 17 (1991) %produced as part of the Arcetri/Cambridge/NRL 'CHIANTI' atomic data base collaboration % % P.R. Young Feb. 1996.
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: NIST Database for Atomic Spectroscopy, Version 1.0,
NIST Standard Reference Database 61, 1995
%A values: from a 10 configuration model of Fe IX used in "superstructure"
%comment: the following configurations were used in the model:
3s2 3p6, 3s2 3p5 3d, 3s 3p6 3d
3s 3p5 3d2, 3s2 3p4 3d2, 3s0 3p6 3d2, 3p3 3d3
3s2 3p5 {4s, 4p, 4d, 4f}
Observed energy values were used to compute the A values.
The most significant differences over a 3 conf model for Fe IX are that
the gf value for the 171.07 transition is reduced to 2.933 (i.e. 25% lower
than previously). This will be reflected in the collision strengths for
this transition.
% produced as part of the Arcetri/Cambridge/NRL 'CHIANTI' atomic data base collaboration
%
% P.R. Young, Feb 95
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_9.splups
%oscillator strengths: SUPERSTRUCTURE calculations (see fe_9.wgfa for details)
%collision strengths: Fawcett & Mason, 1991, ADNDT 47, 17
%comments:
The transitions up from the ground were fitted and
presented in Mason, 1994, ADNDT, 57, 305
The few remaining unfitted transitions don't
affect the level balance.
Have scaled the 1 - 13 omegas by the ratio of the superstructure to
the FM oscillator strengths. See the .wgfa file for detail.
% produced as part of the Arcetri/Cambridge/NRL 'CHIANTI' atomic data base collaboration
%
% P.R. Young, Feb 95