J/A+A/643/A156 MCDHF calculations of TiII (Li+, 2020)
Theoretical investigation of oscillator strengths and lifetimes in Ti II.
Li W., Hartman H., Wang K., Jonsson P.
<Astron. Astrophys. 643, A156 (2020)>
=2020A&A...643A.156L 2020A&A...643A.156L (SIMBAD/NED BibCode)
ADC_Keywords: Atomic physics
Keywords: atomic data
Abstract:
Accurate atomic data for TiII are essential for abundance analyses in
astronomical objects. The aim of this work is to provide accurate and
extensive results of oscillator strengths and lifetimes for TiII.
The multiconfiguration Dirac-Hartree-Fock (MCDHF) and relativistic
configuration interaction (RCI) methods, which are implemented in the
general-purpose relativistic atomic structure package GRASP2018, were
used in the present work. In the final RCI calculations, the
transverse-photon (Breit) interaction, the vacuum polarization, and
the self-energy corrections were included.
Energy levels and transition data were calculated for the 99 lowest
states in TiII. Calculated excitation energies are found to be in
good agreement with experimental data from the Atomic Spectra Database
(ASD) of the National Institute of Standards and Technology (NIST)
based on the study by Huldt et al. (Physica Scripta 25, 401 (1982)).
Lifetimes and transition data, e.g. line strengths, weighted
oscillator strengths, and transition probabilities for radiative
electric dipole (E1),magnetic dipole (M1), and electric quadrupole
(E2) transitions are given and extensively compared with results from
previous calculations and measurements, when available. The present
theoretical results of the oscillator strengths are in overall better
agreement with values from the experiments than the other theoretical
predictions. The computed lifetimes of the odd states are in excellent
agreement with the measured lifetimes. Finally, we suggest a
relabelling of the 3d2(12D)4p y2D3/2o and z2P3/2o
levels.
Description:
Tables 3 presents electric dipole (E1), magnetic dipole (M1), and
electric quadrupole (E2) transition data between the states of the
calculated energy levels for the TiII ion. In the Table transition
data, such as wavelengths, line strengths, weighted oscillator
strengths, transition rates of E1, M1, E2 transitions are given.
Wavelength and wavenumber values are adjusted to match the level
energy values in the NIST ASD. For E1 and E2 transitions, the line
strengths, weighted oscillator strengths and radiative transition
probabilities are given in the length gauge.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 119 3139 Transition data of E1, M1, E2 transitions for TiII
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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- 31 A31 --- Upper Upper level
34- 64 A31 --- Lower Lower level
67- 68 A2 --- EM Type of transition
71- 75 I5 cm-1 deltaE Transition energy (1)
78- 88 F11.3 0.1nm lambda Wavelength of transition (1)
91- 99 E9.3 --- S Line strength (in au) in the length gauge
(for E1 and E2)
102-108 F7.3 [-] log(gf) Weighted oscillator strength in the length
gauge (for E1 and E2)
111-119 E9.3 s-1 A Radiative transition probability in the
length gauge (for E1 and E2)
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Note (1): Transition energies and wavelengths are adjusted to match the level
energy values in the NIST ASD.
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Acknowledgements:
Wenxian Li, wenxian.li(at)mau.se
(End) Wenxian Li [MAU], Patricia Vannier [CDS] 29-Sep-2020