Radiative transition properties including line strengths, oscillator strengths, and transition rates for Ra II

In this paper, we calculate the energy and radiative transition properties of singly charged Ra using the singles and doubles approximated relativistic coupled-cluster method. The excitation energies of the (7 - 12)S (1/2), (7 - 12)P-1/2,P-3/2, (6 - 10)D-3/2,D-5/2 states in Ra+ are reported. The results are compared with available experimental results, showing a good agreement. Accurate values along with their uncertainties of the electric-dipole (E1), electric-quadrupole (E2), and several important magnetic-dipole (M1) matrix elements for transitions in singly charged Ra are determined by the relativistic coupled-cluster method at different approximations. Using these computed E1, E2, and M1 matrix elements, we also provide the related radiative transition properties of Ra+, including line strengths, oscillator strengths, and transition rates. Furthermore, we also investigate the role of electron correlation in these properties. To the best of our knowledge, many results are reported for the first time. Present work reports a high-precision atomic property calculation of Ra+ and is beneficial for present and future experiments using Ra+ targeting various applications such as atomic clocks and studies of parity non-conservation. (C) 2021 Published by Elsevier Ltd.

Automated summary

This study calculates the energy and radiative transition properties of singly charged Ra using the singles and doubles approximated relativistic coupled-cluster method. The results are compared with experimental data, providing accurate values of electric and magnetic matrix elements for transitions in Ra+. This work reports high-precision atomic property calculations of Ra+ and discusses the role of electron correlation in these properties.