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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
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:
FileName Lrecl Records Explanations
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
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
Bytes Format Units Label Explanations
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)
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.
Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
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)
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).
Global notes: Note (G1): Ritz wavenumbers rounded down to seven significant figures from Johansson (private communication)
Acknowledgements: Juliet C. Pickering
(End) Patricia Bauer [CDS] 23-Jul-2001
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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