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We have reported the energies and transition parameters for allowed transition (electric dipole, E1), and forbidden transitions (electric quadrupole, E2, and magnetic dipole, M1) for quadruply ionized radon (Rn V, Z = 86) for energetically low lying levels. The present results were performed using two independent computational strategies of the Hartree-Fock calculation with relativistic corrections and superposition of configurations (Cowan's HFR method) and the general-purpose relativistic atomic structure package based on the fully relativistic multiconfiguration Dirac-Fock (MCDF) method. We have compared our results with the results available in the literature to assess the accuracy of the data. We predict that new energy levels and transition parameters, where no other experimental or theoretical results are available, will form the basis for future experimental work. [ABSTRACT FROM AUTHOR]

The energies and lifetimes for 5p 6 , 5p 5nf (n = 4-10), 5p 5np (n = 6-10), 5p 5nh (n = 6-10), 5p 5nd (n = 5-10), 5p 5ns (n = 6-10), 5p 5ng (n = 5-10), and 5p 5ni (n = 7-10) configurations and the transition parameters for allowed transition (electric dipole E1), and forbidden transitions (electric quadrupole E2, and magnetic dipole M1) are presented for triply ionized lanthanum (La IV, Z = 57). The present results are obtained from a Hartree-Fock calculation with relativistic corrections and superposition of configurations (Cowan's HFR method) and generalpurpose relativistic atomic structure package based on a fully relativistic multiconfiguration Dirac-Fock method. Comparisons are made with experimental and other available theoretical results to assess the reliability and accuracy of the present calculations. Moreover, some new wavelengths, oscillator strengths and transition probabilities of E1, E2, and M1 transitions have been obtained using these methods. These results are reported for the first time in this work. [ABSTRACT FROM AUTHOR]

We have reported the energies and radiative lifetimes of levels for doubly ionized xenon (Xe III) and radon (Rn III). The calculations have been performed using the general-purpose relativistic atomic structure package based on fully relativistic multiconfiguration Dirac–Fock method. We have compared the results obtained from this work for (Xe III) with previous works in available literature. For (Rn III), there is no data except a few energy levels. Hence, we have presented new values on the energy levels of (Rn III). [ABSTRACT FROM AUTHOR]

Using the general-purpose relativistic atomic structure package based on the fully relativistic multiconfiguration Dirac–Fock method, we have reported the electric dipole transition (E1) parameters such as wavelengths, weighted oscillator strengths, transition rates (or probabilities) and line strengths for 5s-5p and 5p-5d transitions in Xe2+. In calculations, the Breit interaction and quantum electrodynamic effects have been included as perturbations. The calculated values for energy levels including valence and core-valence correlation have been compared with other available experimental and theoretical values in literature. Our transition results can provide useful data for, in particular, experimental works in future. [ABSTRACT FROM AUTHOR]