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J/A+A/511/A68       Transitions of CrII                 (Gurell+, 2010)

The FERRUM project: laboratory measured transition probabilities for Cr II. Gurell J., Nilsson H., Engstroem L., Lundberg H., Blackwell-Whitehead R. Nielsen K.E., Mannervik S. <Astron. Astrophys. 511, A68 (2010)> =2010A&A...511A..68G
ADC_Keywords: Atomic physics Keywords: atomic data - line: identification - methods: laboratory - techniques: spectroscopic Abstract: To measure transition probabilities for CrII transitions from the z4HJ, z2DJ, y4FJ and y4GJ levels in the energy range 63000 to 68000cm-1. Radiative lifetimes were measured using time-resolved laser-induced fluorescence from a laser-produced plasma. In addition, branching fractions were determined from intensity calibrated spectra recorded with a UV Fourier transform spectrometer. The branching fractions and radiative lifetimes have been combined to yield accurate transition probabilities and oscillator strengths. We present laboratory measured transition probabilities for 145 CrII lines and radiative lifetimes for 14 CrII levels. The laboratory measured transition probabilities are compared to the values from semi-empirical calculations and laboratory measurements in the literature. Description: Wavelengths and transition probabilities for CrII lines. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table2.dat 97 161 Classification of transitions, wavenumber, wavelength, experimental and theoretical branching fractions, A-value and the corresponding uncertainty table3.dat 47 146 Wavelength, wavenumber, energy of the lower energy level of each transition and log(gf)
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 31 A31 --- UConf Configuration and term of upper energy level 33- 58 A26 --- LConf Configuration and term of lower energy level 60- 67 F8.2 cm-1 sigma ? Wavenumber of the corresponding transition 69- 76 F8.3 0.1nm lambda ? Air wavelength of the corresponding transition 78- 82 F5.3 --- BFexp ? Experimentally determined branching fraction 84- 88 F5.3 --- BFthe ? Theoretical branching fraction (G1) 90- 94 F5.2 10+7s-1 Aij ? Transition rate of the corresponding transition 96- 97 I2 % e_Aij ? Uncertainty of the determined A-value (in percent)
Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 8 F8.3 0.1nm lambda Vacuum wavelength of the corresponding transition 10- 17 F8.2 cm-1 sigma Wavenumber of the corresponding transition 19- 26 F8.2 cm-1 Elow Energy of the lower energy level in the transition 28- 33 F6.3 --- loggf Experimentally determined log(gf) (1) 35- 40 F6.3 --- loggf1 Theoretical log(gf) from Kurucz, R.L. 1988 (2) 42- 47 F6.2 --- loggf2 Theoretical log(gf) from Raasen & Uylings (G1)
Note (1): Use of the theoretical log(gf)s from Raasen & Uylings for the three transitions at 27328.36cm-1 is encouraged due to line blending in the experimental spectrum. Note (2): Kurucz R.L. 1988, Trans. IAU, XXB, M. McNally, ed., (Dordrecht: Kluwer), 168
Global Notes: Note (G1): From Raasen & Uylings 1997, unpublished data available at: ftp://ftp.wins.uva.nl/pub/orth/chromium

(End) Jonas Gurell [Stockholm University, Sweden] 21-Dec-2009
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