Electric dipole polarizability of alkaline-Earth-metal atoms from perturbed relativistic coupled-cluster theory with triples

摘要

The perturbed relativistic coupled-cluster (PRCC) theory is applied tocalculate the electric dipole polarizabilities of alkaline Earth metal atoms.The Dirac-Coulomb-Breit atomic Hamiltonian is used and we include the tripleexcitations in the relativistic coupled-cluster (RCC) theory. The theoreticalissues related to the triple excitation cluster operators are described indetail and we also provide details on the computational implementation. ThePRCC theory results are in good agreement with the experimental and previoustheoretical results. We, then, highlight the importance of considering theBreit interaction for alkaline Earth metal atoms.