We have reported a relativistic multiconfiguration Dirac-Fock calculation including Breit and quantum electrodynamic contributions on the level structure of atomic actinium, Ac I (Z = 89). The computations have been carried out for the low 45 even and 60 odd-parity levels, and the electric dipole transition parameters (wavelengths, oscillator strengths and transition probabilities) for some transitions between these levels. Comparison has been also made with other results in available literature.

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We have calculated the energies of some low-lying levels (6d7s 2 , 6d 2 7s, 6d7s7p and 6d 2 7p) and electric dipole transition parameters (wavelengths, oscillator strengths and transition probabilities) between them for neutral actinium (Z = 89). In the calculations, the correlation and relativistic effects are considered by multiconfiguration Hartree-Fock method within the framework Breit-Pauli Hamiltonian. The results obtained are compared with the available experimental and theoretical works in the literature.

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Hydrogen-like ions with high Z present unique opportunities to promote the understanding of atomic structure. On the other hand, determining the atomic structure of hydrogen-like atoms provides us the test of relativistic effects as well as accurate values of the spectral characteristics required for many applications. For this reason we have calculated level energies of hydrogen like thorium (Th89+, Z = 90) with both multiconfiguration Hartree–Fock (MCHF) and multiconfiguration Dirac–Fock (MCDF) methods. These calculations have contained the Breit–Pauli relativistic corrections in MCHF calculation and quantum electrodynamics effects in MCDF calculations besides electron correlations. The wavelengths, λ, weighted oscillator strengths, gf-value, and transition probabilities, Aki, have been also represented for allowed (E1) and forbidden (E2 and M1) transitions. We have compared our results with only theoretical work results because there is no available experimental data for Th89+.

Hidrojen benzeri iyonlar bir atomun en basit yapılı halidir, bu konuda çalışmak atomik yapıları tanımlamada kullanılan yöntemlerin test edilmesini sağlar. Hidrojen benzeri iyonlar hakkında çalışmalar yapmak atomik yapıyı anlamak için de bir fırsattır. Bu sebeple hidrojen benzeri nobelyum (No 101+ , Z=102) için bir çalışma gerçekleştirildi. No 101+ seviye yapısı hesaplamalarında çok konfigürasyonlu Hartree-Fock ve çok konfigürasyonlu Dirac Fock yöntemlerinin her ikisi de kullanıldı. Hesaplamalar bazı relativisitik düzeltmeleri ve kuantum elektrodinamik etkileri içerir. Ulaşılabilir kaynaklarda No 101+ için oldukça az sayıda teorik çalışma vardır, deneysel çalışma ise yoktur. Hesaplama sonuçları diğer teorik çalışma sonuçlarıyla karşılaştırılarak yorumlandı.

Studying hydrogenic ions with high Z is an occasion to understand atomic structure. It also provides a reliable test of methods used to determine atomic structures. Many fields and applications require precise atomic data. For this reason, a hydrogen-like study is performed for lawrencium (Lr102+, Z = 103). The energy levels of hydrogen-like lawrencium are calculated with both multiconfiguration Hartree–Fock (MCHF) and multiconfiguration Dirac–Fock (MCDF) methods. The calculations contain Breit–Pauli relativistic corrections in MCHF calculation and the transverse photon and quantum electrodynamics (QED) effects in MCDF calculation along with electron correlations. In addition, some transition parameters (wavelengths, λ, logarithmic weighted oscillator strengths, log(gf) value, and transition probabilities, Aki) for allowed (E1) and forbidden (E2 and M1) transitions are investigated. The results from this study are compared with only a few theoretical works, but there is no available experimental data yet for Lr102+.

We have reported a relativistic multiconfiguration Dirac-Fock (MCDF) study on low-lying level structures of protactinium IV (Z = 91) and uranium V (Z = 92) ions. Excitation energies and electric dipole (E1) transition parameters (wavelengths, oscillator strengths, and transition rates) for these low-lying levels have been given. We have also investigated the influence of the transverse Breit and quantum electrodynamic (QED) contributions besides correlation effects on the level structure. A comparison has been made with a few available data for these ions in the literature.