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A pulsed discharge light source was used to study the two and three times ionized argon (Ar II, Ar III) spectra in the 480-6218 Å region. A set of 129 transitions of Ar III and 112 transitions of Ar IV were classified for the first time. We extended the analysis of Ar III to five new energy levels belonging to 3s 2 3p 3 4d, 3s 2 3p 3 5s odd configu...
Context in source publication
Context 1
... strong configuration interactions for the even parity (Table 5) between 3s 2 3p 4 -3s3p 4 3d and 3s 2 3p 4 -3p 6 configurations were optimized and fixed at 90%, 85%, and 70% of their HF values, respectively. For the odd parity (Table 6), the interaction integrals between 3s3p 5 -3s 2 3p 3 3d and 3s 2 3p 3 3d-3s 2 3p 3 4d configurations were set free in the calculation. In the energy adjustment of Ar III, the standard deviation was 101 and 339 cm −1 for the even and odd parities, respectively. ...
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Citations
Aims . The aim of this work is to present accurate and extensive results of energy spectra and transition data for the S II, Cl III, and Ar IV ions. These data are useful for understanding and probing physical processes and conditions in various types of astrophysical plasmas.
Methods . The multiconfiguration Dirac–Hartree–Fock (MCDHF) and relativistic configuration interaction (RCI) methods, which are implemented in the general-purpose relativistic atomic structure package GRASP2K, are used in the present work. In the RCI calculations the transverse-photon (Breit) interaction, the vacuum polarization, and the self-energy corrections are included.
Results . Energy spectra are presented comprising the 134, 87, and 103 lowest states in S II, Cl III, and Ar IV, respectively. Energy levels are in very good agreement with NIST database recommended values and associated with smaller uncertainties than energies from other theoretical computations. Electric dipole (E1), magnetic dipole (M1), and electric quadrupole (E2) transition data are computed between the above states together with the corresponding lifetimes. Based on internal validation, transition rates for the majority of the stronger transitions are estimated to have uncertainties of less than 3%.
