Resonance Energies of Autoionizing Rydberg Series from the Single Photoionization of the 4s²4p² (³P₁) and 4s²4p² (¹D₂) Excited States of the Br³⁺ Ion

We report in this paper high lying precise resonance energies of the 4s4p² (³P₁)np and 4s4p² (¹D₂)np autoionizing Rydberg series from the single photoionization of the 4s²4p² (³P₁) and 4s²4p² (¹D₂) metastable states of Br³⁺. Calculations are performed in the framework of the screening constant per unit nuclear charge (SCUNC) method. Excellent agreement was obtained with recent experimental measurements by Macaluso et al. [J. Phys. B: At. Mol. Opt. Phys. 52, 145 002 (2019)] for n = 5–17. The analysis of the present results has been carried out within the framework of standard quantum defect theory and the SCUNC procedure by calculating the effective nuclear charge. The present SCUNC data predicted up to n = 40 could be of great importance to the atomic physics community in understanding the chemical evolution of Br in the Universe and in determining its abundance in astrophysical nebulae.