J/ApJS/215/23 FeI radiative lifetime and branching fractions (Den Hartog+, 2014)
Fe I oscillator strengths for transitions from high-lying even-parity levels.
Den Hartog E.A., Ruffoni M.P., Lawler J.E., Pickering J.C., Lind K.,
Brewer N.R.
<Astrophys. J. Suppl. Ser., 215, 23 (2014)>
=2014ApJS..215...23D 2014ApJS..215...23D
ADC_Keywords: Atomic physics ; Line Profiles ; Spectroscopy
Keywords: atomic data; stars: abundances; Sun: abundances
Abstract:
New radiative lifetimes, measured to ±5% accuracy, are reported for
31 even-parity levels of Fe I ranging from 45061cm-1 to 56842cm-1.
These lifetimes have been measured using single-step and two-step
time-resolved laser-induced fluorescence on a slow atomic beam of iron
atoms. Branching fractions have been attempted for all of these
levels, and completed for 20 levels. This set of levels represents an
extension of the collaborative work reported in Ruffoni et al.
(2013ApJ...779...17R 2013ApJ...779...17R; 2014, J/MNRAS/441/3127). The radiative lifetimes
combined with the branching fractions yields new oscillator strengths
for 203 lines of Fe I. Utilizing a 1D-LTE model of the solar
photosphere, spectral syntheses for a subset of these lines which are
unblended in the solar spectrum yields a mean iron abundance of
<log[ε(Fe)]≥7.45±0.06.
Description:
From our recent work for the APOGEE and Gaia-ESO surveys (Ruffoni et
al. 2013ApJ...779...17R 2013ApJ...779...17R; 2014, J/MNRAS/441/3127), we have assembled a
catalog of high-resolution, intensity calibrated FeI line spectra,
measured in emission by Fourier transform (FT) spectroscopy in
overlapping regions from 1800/cm to 35500/cm. From this catalog, we
have used the two spectra shown in Table 2 to measure branching
fractions (BFs) for lines linked to many of the levels listed in Table 1.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 88 33 Radiative lifetimes for even parity FeI levels
table4.dat 82 227 Experimental branching fractions, transition
probabilities, and log(gf)s for 227 lines of Fe I
organized by increasing wavelength
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See also:
J/MNRAS/441/3127 : FeI oscillator strengths for Gaia-ESO (Ruffoni+, 2014)
J/A+A/554/A132 : Iron line list (FeI and FeII) (Genovali+, 2013)
J/A+A/377/361 : Fe II transition probabilities and loggf (Pickering+, 2001)
J/A+A/293/967 : IRON Project VII. FeII radiative transitions (Nahar, 1995)
J/ApJS/94/221 : New multiplet table for FeI (Nave+, 1994)
J/A+A/274/555 : FeI lines asymmetry in solar spectrum (Stathopoulou+ 1993)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1 I1 --- S [1/2] Step excitation number (1)
3- 24 A22 --- Config Configuration (2)
26- 30 A5 --- Term Term (2)
32 I1 --- J [0/7] J value
34- 42 F9.3 cm-1 E1 [45061.3/56842.8] Upper energy level (2)
44- 52 F9.3 cm-1 E0 ? Intermediate energy level (2)
54- 60 F7.3 nm lam1 [268.1/501.3] Step 1 laser wavelength
62- 68 F7.3 nm lam2 [364.7/528.4]? Step 2 laser wavelength
70- 72 I3 nm lambda [353/560]? Observation wavelength (3)
74- 77 F4.1 ns tau [5.6/18.5]? Our lifetime (±5% uncertainty)
79- 82 F4.1 ns tauP ? Published lifetime
84- 86 F3.1 ns e_tauP ? LifeTP uncertainty
88 A1 --- r_tauP Reference for LifeTP (4)
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Note (1): Code as follows:
1 = Radiative lifetimes measured with two-step excitation
2 = Radiative lifetimes measured with single-step excitation
Note (2): Configurations, terms, level energies, and wavelengths are from the
Nave et al. (1994, J/ApJS/94/221).
Note (3): Fluorescence is observed through ∼10nm bandpass multi-layer
dielectric filters. The filter angle is adjusted to center the
bandpass at the indicated wavelength.
Note (4): Reference as follows:
d = Marek et al. (1979PhyS...19..325M 1979PhyS...19..325M).
e = O'Brian et al. (1991JOSAB...8.1185O 1991JOSAB...8.1185O) TR-LIF with uncertainty of ±5%.
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 10 F10.4 0.1nm lamAir [3211/22381] Wavelength in air; Angstroms (1)
12- 20 F9.3 cm-1 E1 [45061.3/53169.2] Upper energy level (1)
22 I1 --- J1 [0/7] Upper level J value (1)
24- 32 F9.3 cm-1 E0 [19350.8/43499.6] Lower energy level (1)
34 I1 --- J0 [0/6] Lower level J value (1)
36- 40 F5.3 --- BF [0.001/1]? Branching Fraction
42- 45 F4.1 % e_BF [0/40]? Uncertainty in BF in %
47- 53 F7.3 10+6/s A [0.04/156.3]? Transition probability
55- 59 F5.2 [-] log(gf) [-3.4/0.7]? Log of degeneracy times
oscillator strength
61- 64 F4.2 [-] e_log(gf) ? Uncertainty in log(gf)
66- 70 F5.2 [-] log(gf)P ? Previously published log(gf) (2)
72- 75 F4.2 [-] e_log(gf)P ? Uncertainty in log(gf)P (2)
77- 80 A4 --- r_log(gf)P Reference for log(gf)P (3)
82 A1 --- Cal [ALP] Calibration method for log(gf)P (4)
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Note (1): Most wavelengths are from Nave et al. (1994, J/ApJS/94/221).
Note (2): Published log(gf)'s are taken from the critical compilation of
Fuhr and Weise (2006JPCRD..35.1669F 2006JPCRD..35.1669F).
Note (3): Acronyms have the following meaning:
OB91 = O'Brian et al. (1991JOSAB...8.1185O 1991JOSAB...8.1185O);
Ma74 = May et al. (1974A&AS...18..405M 1974A&AS...18..405M);
Ba91 = Bard et al. (1991A&A...248..315B 1991A&A...248..315B);
Ba94 = Bard & Kock (1994A&A...282.1014B 1994A&A...282.1014B);
Br74 = Bridges & Kornblith (1974ApJ...192..793B 1974ApJ...192..793B).
Note (4): Calibration method indicates the method by which the published
data was put on an absolute scale as described in the text
(see section 3 for further explanations):
L = the radiative lifetime was measured and used to convert the BF's into
transition probabilities.
A = the previous data arises from an emission measurement from a
wall-stabilized arc.
P = from O'Brian et al. (1991JOSAB...8.1185O 1991JOSAB...8.1185O).
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 09-Feb-2015