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Photoionization data of the trans-Fe element Rb${}^{2+}$ are reported. Rydberg series 4s${}^{2}$4p${}^{4}$(${}^{1}$D${}_{2}$) n d and 4s${}^{2}$4p${}^{4}$(${}^{3}$P${}_{1}$) n d Rydberg series of Rb${}^{2+}$ from the ${}^{2}$P${}^\circ$${}_{3}$${}_{/}$${}_{2}$ ground state and the ${}^{2}$P${}^\circ$${}_{1/2}$ metastable state of Rb${}^{2+}$ converging respectively to the 4s${}^{2}$4p${}^{4}$(${}^{1}$D${}_{2}$) 4s${}^{2}$4p${}^{4}$(${}^{3}$P${}_{1}$) series limit in Rb${}^{3}$${}^{+}$ are considered.\ Calculations are performed in the framework of the Screening constant by unit nuclear charge (SCUNC) method. 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. 49 (2016), 235002; 50 (2017), 119501)]. The energy deviations with respect to the ALS data are equal to 0.001 eV. New data are tabulated for $n=21-40$.

Screening Constant by Unit Nuclear Charge Photoionization of Rb\(^{2+}\) Ions