Title: Electron-correlation study of Y III-Tc VII ions using a relativistic coupled-cluster theory,
Abstract: Spectroscopic properties, useful for plasma diagnostics and astrophysics, of
a few rubidium-like ions are studied here. We choose one of the simplest, but
correlationally challenging series where $d-$ and $f-$ orbitals are present in
the core and/or valence shells with $4d$ $^2D_{3/2}$ as the ground state. We
study different correlation characteristics of this series and make precise
calculations of electronic structure and rates of electromagnetic transitions.
Our calculated lifetimes and transition rates are compared with other available
experimental and theoretical values. Radiative rates of vacuum ultra-violet
electromagnetic transitions of the long lived Tc$^{6+}$ ion, useful in several
areas of physics and chemistry, are estimated. To the best of our knowledge,
there is no literature for most of these transitions.