Accurate Estimates of Circumstellar and Interstellar Lines of Quadruply Ionized Vanadium Using the Coupled Cluster Approach

Accurate ab initio calculations have been carried out to study the valence electron removal energies and oscillator strengths of astrophysically important electromagnetic transitions of quadruply ionized vanadium, V4+. Many important electron correlations are considered to all orders using the relativistic coupled-cluster theory. Calculated ionization potentials and fine-structure splittings are compared with the experimental values, wherever available. To our knowledge, oscillator strengths of electric dipole transitions are predicted for the first time for most of the transitions. The transitions span in the range of ultraviolet, visible, and near-infrared regions and are important for astrophysical observations.