Application of Relativistic Coupled-cluster Theory to Heavy Atomic Systems with Strongly Interacting Configurations: Hyperfine Interactions in $^{207}Pb^+$

摘要

This work presents a first time accurate calculation of the magnetic dipolehyperfine structure constants for the ground state and some low-lying excitedstates of Pb$^+$. By comparing different levels of approximation withexperimental results, we demonstrate the importance of correlation effectswhich reach beyond lower order relativistic many body perturbation theory.Employing relativistic coupled-cluster theory we obtain a quantitativeunderstanding of the core-polarization and correlation effects inherent in thissystem and observe completely different trends compared to $Ba^+$.