Magnetic dipole transitions of Pb-like ions from the multiconfiguration relativistic random-phase approximation.

Abstract

The multiconfiguration relativistic random-phase approximation theory is applied to magnetic dipole transitions in atoms. Excitation energies and oscillator strengths from the ground level $^{3}$${\mathit{P}}_{0}$ to the excited level $^{3}$${\mathit{P}}_{1}$ of Pb-like ions are calculated as prototypal examples. The first $^{3}$${\mathit{P}}_{1}$ level for the neutral Pb atom, which is missing in the relativistic random-phase approximation, appears naturally in this theory, which accounts for two-particle--two-hole correlations.