Electric dipole polarizabilities of doubly ionized alkaline Earth metal ions from perturbed relativistic coupled-cluster theory

Abstract

Using perturbed relativistic coupled-cluster (PRCC) theory we compute the ground state electric dipole polarizability, $\alpha$, of doubly ionized alkaline earth metal ions ${\mathrm{Mg}}^{2+}$, ${\mathrm{Ca}}^{2+}$, ${\mathrm{Sr}}^{2+}$, ${\mathrm{Ba}}^{2+}$ and ${\mathrm{Ra}}^{2+}$. In the present work we use the Dirac-Coulomb-Breit atomic Hamiltonian and we also include the Uehling potential, which is the leading order term in the vacuum polarization corrections. We examine the correction to the orbital energies arising from the Uehling potential in the self-consistent field calculations as well as perturbatively. Our results of $\alpha$ are in very good agreement with the experimental data, and we observe a change in the nature of the orbital energy corrections arising from the vacuum polarization as we go from ${\mathrm{Mg}}^{2+}$ to Ra${}^{2+}$.

10 pages, 12 tables

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• Medium-mass nuclei from chiral nucleon-nucleon interactions
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• Relativistic coupled-cluster single-double method applied to alkali-metal atoms
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Cited by in corpus (7)

• Correlation trends in the ground state static electric dipole polarizabilities of closed-shell atoms and ions
• Electric dipole polarizability of alkaline-Earth-metal atoms from perturbed relativistic coupled-cluster theory with triples
• Triple excitations in perturbed relativistic coupled-cluster theory and Electric dipole polarizability of groupIIB elements
• RCC calculation of electric dipole polarizability and correlation energy of Cn, Nh${}^{+}$ and Og: Correlation effects from lighter to superheavy elements
• Electric dipole polarizability of group-IIIA ions using PRCC: Large correlation effects from nonlinear terms
• RCCPAC: A parallel relativistic coupled-cluster program for closed-shell and one-valence atoms and ions in FORTRAN
• Relativistic semiempirical-core-potential calculations in Ca${}^{+}$, Sr${}^{+}$, and Ba${}^{+}$ ions on Lagrange meshes