Quantum defect and Rydberg energy level calculations for 85Rb and 87Rb by Weakest Bound Electron Potential Model

Abstract

The Weakest Bound Electron Potential Model (WBEPM) is an effective emerging method for atomic structure calculations that gives results compatible with the experimental observations. In this paper, we have done theoretical calculations of quantum defects and Rydberg energies of high-lying Rydberg energy levels for 85Rb and 87Rb of nS1/2 (n= 14 – 85, 87Rb), nP3/2 (n= 31 – 100, 85Rb), nD3/2 (n= 14 – 85, 87Rb) and nD5/2 (n= 14 – 85, 87Rb) series, through WBEPM. The spectral coefficients for each Rydberg energy level series are determined from Martin's formula and are used to calculate the quantum defects and energy values of the Rydberg energy levels. The obtained results are compared with the available experimental data and show a minimum deviation of the theoretically calculated values from the experimental data. For more insight into the results, values of the Rydberg energy levels and the quantum defects are plotted as a function of the principal quantum number, respectively.