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Description
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 3d^2^(^1^_2_D)4p y^2^D_3/2_^o^ and z^2^P_3/2_^o^ levels.
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