Single Photoionization Study of Br3+ via the Screening Constant by Unit Nuclear Charge Method

Abstract

We report accurate high-lying energy resonances of the Br${}^{3+}$ ions. Rydberg series of resonances due to 4p\(\to\)nd and 4s\(\rightarrow\)np transitions converging respectively to the 4s${}^2$4p (${}^2$P${}_{3/2}$) and 4s4p${}^2$(${}^4$P${}_{3/2}$, ${}^2$D${}_{5/2}$) series limits in Br${}^{4+}$ are considered. The calculations are performed using the screening constant by unit nuclear charge (SCUNC) method up to $n=40$. The results obtained are compared with recent ALS measurements of Macaluso et al., [J. Phys. B: At. Mol. Opt. Phys. 52 (2019), 145002]. Analysis of the present results is achieved in the framework of the standard quantum-defect theory and of the SCUNC procedure by calculating the effective charge. It is shown that the SCUNC method reproduces excellently the ALS results up to $n=27$. Our predicted data up to $n=40$ may be of great importance for the atomic physics community in connection with the modeling of plasma and astrophysical systems.