J/A+A/377/361 Fe II transition probabilities and loggf (Pickering+, 2001)
The FERRUM Project: Branching ratios and atomic transition probabilities of
Fe II transitions from the 3d6(a3F)4p subconfiguration in the visible
to VUV spectral region
Pickering J.C., Johansson S., Smith P.L.
<Astron. Astrophys. 377, 361 (2001)>
=2001A&A...377..361P 2001A&A...377..361P
ADC_Keywords: Atomic physics
Keywords: atomic data - line: identification - techniques: spectroscopic -
stars: abundances
Abstract:
We report measurements of the relative intensities of 81 emission
lines of Fe II between 160nm and 350nm (62168cm-1 to 28564cm-1)
from 4 levels by high resolution Fourier transform spectrometry, using
a Penning discharge lamp as light source. These relative intensities
have been used to determine the line branching fractions, which have
then been combined with accurate experimental radiative lifetime
measurements reported recently to give absolute transition
probabilities and oscillator strengths for 81 lines. The accuracy of
these f-values is compared with other previous experimental
measurements, and with theoretical values. The new transition
probabilities will allow accurate determinations of Fe II abundances
in a wide variety of astrophysical objects.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 80 95 Absolute transition probabilities and oscillator
strengths of Fe II transitions.
table2.tex 235 169 LaTeX version of table 2
table3.dat 88 95 Finding list of Fe II transitions and
log gf values
table3.tex 176 151 LaTeX version of table 3
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See also:
VI/74 : Atomic Energy Level Data (NIST 1993)
J/A+A/293/967 : IRON Project VII. Fe II radiative transitions (Nahar, 1995)
ftp://ftp.wins.uva.nl/pub/orth/iron/FeII.E1 : Fe II loggf (Raassen, 1999)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1 A1 --- Level Level (1)
3- 10 F8.3 0.1nm lambdaVac Vacuum wavelength
12- 19 F8.3 0.1nm lambdaAir ? Wavelength in air for λ>2000Å
21- 28 F8.2 cm-1 sigma Vacuum wavenumber (G1)
30 A1 --- Note [x b] Note (2)
32- 36 F5.2 --- BF ? branching fraction;
38- 39 I2 % e_BF ? Percentage relative uncertainty in BF
41- 48 E8.3 s-1 A ? Absolute transition probability, found by
combining BF and the measured lifetime
50- 51 I2 % e_A ? Percentage uncertainty in A
53- 57 F5.2 --- loggf ? Oscillator strength measured in this work
59- 62 F4.2 --- e_loggf ? uncertainty (dex) in log gf
64- 68 F5.2 --- loggfR Raassen oscillator strength (1999,
ftp://ftp.wins.uva.nl/pub/orth/iron/FeII.E1)
70- 74 F5.2 --- loggfK Kurucz oscillator strength (2000, priv. com.)
76- 80 F5.2 --- loggfN ? Nahar oscillator strength
(1995, Cat. J/A+A/293/967)
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Note (1): Levels:
A: Level 62065 cm-1 3d6(a3F)4p y4F3.5 3.50ns ± 0.3ns
99.87% complete, 0.02% outside, 0.11% blended
B: Level 63948 cm-1 3d6(a3F)4p y4G4.5 2.7 ns ± 0.3ns
99.97% complete, 0.03% outside
C: Level 62945 cm-1 3d6(a3F)4p x4D3.5 2.8 ns ± 0.3ns
99.98% complete, 0.02% outside, 3.44% blended
D: Level 64040 cm-1 3d6(a3F)4p y4G3.5 2.8 ns ± 0.3ns
99.96% complete, 0.04% outside
Note (2): Annotations to transitions indicate:
x: transition not observed in this work or in that of Johansson
(private communication);
b: blended line.
For lines annotated with x, the maximum possible branching fraction
has been estimated and from this the maximum value of A and maximum
possible log gf for that transition has also been estimated. Since the
values of A and log gf for lines annotated with x are maximum values
it may be preferable to use the theoretical values for these lines. No
uncertainty in log gf is given for these transitions annotated x since
it is an approximate estimate.
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 8 F8.3 0.1nm lambdaVac Vacuum wavelength
10- 17 F8.3 0.1nm lambdaAir ? Wavelength in air for λ>2000Å
19- 26 F8.2 cm-1 sigma Vacuum wavenumber (G1)
28 A1 --- Note Note (1)
30- 34 F5.2 --- loggf ? Oscillator strength (this work)
36- 39 F4.2 --- e_loggf ? uncertainty (dex) in log gf,
41- 45 F5.2 --- loggfR Raassen oscillator strength (1999,
ftp://ftp.wins.uva.nl/pub/orth/iron/FeII.E1)
47- 56 A10 --- UTerm Upper lever term (2)
58- 66 F9.3 cm-1 UE Upper level energy (2)
68- 78 A11 --- LTerm Lower level term (2)
80- 88 F9.3 cm-1 LE Lower level energy (2)
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Note (1): Annotations indicate:
x: transition not observed in this work or in that of Johansson;
b: a blended line.
For lines annotated with x, the maximum possible branching fraction
has been estimated giving a maximum possible log gf for that
transition; for these lines it may be advisable to use the calculated
values of Raassen (1999) for log gf. No uncertainty in log gf is given
for transitions annotated x.
Note (2): Term and energy of the upper and lower energy levels involved in
each transition. The level energies are taken from Sugar and Corliss
(1985, Cat. VI/74).
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Global notes:
Note (G1): Ritz wavenumbers rounded down to seven significant figures from
Johansson (private communication)
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Acknowledgements: Juliet C. Pickering
(End) Patricia Bauer [CDS] 23-Jul-2001