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 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