Metastable level properties of the excited configuration 4p64d84f4p^{6}4d^{8}4f

Metastable levels in rhodium-like ions with the ground configuration $4p^{6}4d^{9}$ and the excited configurations $4p^{6}4d^{8}4f$ and $4p^{5}4d^{10}$ are investigated. The {\sl ab initio} calculations of the level energies, radiative multipole transition probabilities are performed in a quasirelativistic Hartree-Fock approximation employing an extensive configuration interaction based on quasirelativistic transformed radial orbitals. A systematic trends in behavior of calculated radiative lifetimes of the metastable levels are studied for the ions from $Z=60$ to $Z=92$. The significance of the radiative transitions of higher multipole order ($M2$ and $E3$) for the calculated radiative lifetimes is demonstrated and discussed.Comment: Lithuanian Journal of Physics (in press

Energy levels and radiative rates for transitions in Cr-like Co IV and Ni V

We report calculations of energy levels and radiative rates ($A$-values) for transitions in Cr-like Co IV and Ni V. The quasi-relativistic Hartree-Fock (QRHF) code is adopted for calculating the data although GRASP (general-purpose relativistic atomic structure package) and flexible atomic code (FAC) have also been employed for comparison purposes. No radiative rates are available in the literature to compare with our results, but our calculated energies are in close agreement with those compiled by NIST for a majority of the levels. However, there are discrepancies for a few levels of up to 3\%. The $A$-values are listed for all significantly contributing E1, E2 and M1 transitions, and the corresponding lifetimes reported, although unfortunately no previous theoretical or experimental results exist to compare with our data.Comment: The paper will appear in ADNDT (2016) and in October 2015 on the we

INFLUENCE OF THE TWO-ELECTRON TRANSITIONS ON THE RADIATIVE LIFETIMES OF EXCITED LEVELS IN Be ISOELECTRONIC SEQUENCE

The ions of beryllium isoelectronic sequence (6 ≤ Z ≤ 30) are investigated using configuration interaction on the basis of transformed radial orbitals with a variable parameter. The energy spectra and radiative lifetimes of the levels of configurations 2s 2 , 2s2p, 2p 2 , 2s3l, and 2p3l are obtained. The aim of the present work is the investigation of the influence of the twoelectron transitions. It is shown that the two-electron transitions are decisive for the lifetimes of a few excited levels. The dependence of this influence on Z is discussed