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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(11,12,18,19,22,26): Jupen et al. 1994, MNRAS, 264, 627
%energy levels(all others): NIST Database for Atomic Spectroscopy, Version 1.0,
NIST Standard Reference Database 61, 1995.
%theoretical energy levels (1-54): Bhatia & Doschek, 1995, ADNDT, 60, 97, 1995
%theoretical energy levels (55-172): Malinovsky et al., 1980, ApJ, 235, 665
%comment:
The third energy column contains energy levels derived from
SSTRUCT. For level 10, the SSTRUCT splitting of the 2P levels
was used to compute the 2P1/2 energy from the observed 2P3/2
energy. For the levels in the 3s 3p5 3d configuration, the
averaged difference between the experimental and SSTRUCT
energies for the 4F levels was used to scale all other SSTRUCT
energies in this configuration. The energies in the first and
third columns have been used to derive the wavelengths in the
.wgfa file. (Those calculated with third column energies have
negative values.)
Levels 4 and 5 are observed to have the same energy
(388709 cm^- 1) but this leads to problems in level population
programs so the level energies have been split using the SSTRUCT
energy difference (70 cm^- 1).
%produced as part of the Arcetri/Cambridge/NRL 'CHIANTI' atomic data base collaboration
%
% P.R.Young 17-Jul-02
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 (11,12,18,19,22,26): Jupen et al. MNRAS 264 627 1994
%observed energy levels (all others): NIST Database for Atomic Spectroscopy, Version 1.0,
NIST Standard Reference Database 61, 1995.
%theoretical energy levels (1-54): Bhatia & Doschek, 1995, ADNDT, 60, 97, 1995
%theoretical energy levels (55-172): Malinovsky et al., 1980, ApJ 235, 665
%A values: A SSTRUCT run performed by P.R.Young.
%comment: the A values for transitions between the first 54 levels
have been calculated using a 12 configuration model of Fe X
in SSTRUCT. The configurations included were:
3s2 3p5, 3s 3p6, 3s2 3p4 3d, 3s 3p5 3d, 3p6 3d
3s2 3p3 3d2, 3s 3p4 3d2
3s2 3p2 3d3, 3s 3p3 3d3
3s2 3p4 4s, 3s2 3p4 4p, 3s2 3p4 4d
The observed and scaled SSTRUCT energies were used to compute the A
values. Good agreement was found with Fawcett (ADNDT 47, 319, 1991)
for the important EUV transitions.
Due to memory restrictions, the same model could not be used to
compute the magnetic quadrupole A values that help depopulate the
3s2 3p4 3d metastable levels. Instead, the 3d3 configurations were
omitted. Mason & Nussbaumer (AA 54, 547, 1976) previously gave A
values for the 2P3/2 - 4D7/2 (1-5) and 2P3/2 - 4F7/2 (1-9)
transitions of 70 and 3.3 s- 1. The present values are 47.0 and
0.066. The reasons for this discrepancy are unclear. We also give
magnetic quadrupole A values for three other 3/2 - 7/2 transitions
which are found to be significant in the level balance (transitions
1- 17, 1-21, and 1-24).
For transitions involving levels > 54, the above model was used
without the 3d3 configurations, but including the following extra
configurations:
3s2 3p4 4f, 3s2 3p4 5s, 3s2 3p4 5p
3s 3p5 4s, 3s 3p5 4p, 3s 3p5 5s
%produced as part of the Arcetri/Cambridge/NRL 'CHIANTI' atomic data base collaboration
%
% P.R.Young May 99
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_10.splups
%oscillator strengths: SUPERSTRUCTURE calculations from P.R.Young (see file fe_10.wgfa)
%collision strengths: Bhatia AK & Doschek GA, ADNDT 60, 97 (1996)
%collision strengths: Malinovsky et al., ApJ 235, 665, 1980
%effective collision strengths: Pelan, J.C., Berrington, K.A., 1995, A&AS, 110, 209
%comment: effective collision strengths were provided in the temperature range 5.0 < Log T < 7.0
%comment: For the ground transition only, the upsilons of Pelan & Berrington have been used.
For transitions between levels 1-54, have fitted all transitions
from ground levels, all
transitions between the 3s2 3p4 3d metastable levels
and the 3s 3p6 and 3s2 3p4 3d levels, and selected
metastable to 3s 3p5 3d transitions.
The omega values for the 1-3 and 2-3 transitions have been scaled
upwards by factors of 1.690 and 1.640, respectively. This reflects
the inadequacy of the 4 configuration model in describing accurately
the Fe X target.
The spline values for the (1,2)-(27-31) transitions have
been multiplied by the following factors:
1-27 0.7001 2-27 2.138
1-28 0.7736 2-28 0.3264
1-29 1.978 2-29 0.6179
1-30 0.8087
1-31 0.4617 2-31 0.8307
To account for the differences in the oscillator strengths
between the Bhatia & Doschek and the accurate SSTRUCT model.
For all levels >54, data is only available for transitions to
the two ground levels.
Although for many of the transitions involving levels >62 there
were gf values available, they have been fitted as Type 2
transitions. This is because, as Type 1 transitions they were often
difficult to fit (the 1-89 transition is a typical example).
Some of the 4s transitions (levels 55-62) showed unusual shapes
in the omega structure (e.g., 2-56, 1-58). I'm not sure how
trustworthy this data is.
%produced as part of the Arcetri/Cambridge/NRL 'CHIANTI' atomic data base collaboration
%
% P.R.Young - May 1999
contains the spline fits to the scaled proton collision strengths.
%filename: fe_10.psplups
%rates: Bhatia A.K., Doschek, G.A., ADNDT 60, 97, 1995
%rates: Bely O., Faucher P., A&A 6, 88, 1970 (for 1-2 transition)
%energies: Observed energies from .elvlc file, except for level 10 for which
the theoretical energy from the .elvlc file is used.
%comment: For all transitions except 1 - 2, the rates were only tabulated at
one temperature. I have fit this data with a straight line that is
forced to be zero at a scaled temperature of 0 to emulate the
behaviour of proton rates.
%comment: Fitted using single_temp.pro with scalx=0.90
%produced as part of the Arcetri/Cambridge/NRL 'CHIANTI' atomic data base collaboration
%
% Peter Young 17-Dec-2001