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

Abstract: 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.