Photoionization of \(Rb²⁺\) Ions Using the Screening Constant by Unit Nuclear Charge Formalism

We report in this paper Photoionization data of the Rb\({}²⁺\) ions. Rydberg series of resonances due to \(4p→ nd\) transitions from the \({}²\)P\({}^∘3/2\) ground state and the \({}²\)P\({}^∘1/2\) metastable state of Rb\({}²⁺\) converging to the \(4s^24p^4\) \((^1D_2)\) series limit in Rb\({}³⁺\) are considered.\ Calculations are performed in the framework of the Screening Constant by Unit Nuclear Charge (SCUNC) formalism and accurate data are tabulated up to \(n=40\).\ It is shown that the SCUNC analytical formulas reproduce with an excellent precision, recent ALS measurements of Macaluso et al. [J. Phys. B: At. Mol. Opt. Phys. 50 (2017)]. New data are tabulated for \(n = 25\)-\(40\).