Determination of the dipole polarizability of the alkali-metal negative ions
Abstract
We present electric dipole polarizabilities (αd) of the alkali-metal negative ions, from H- to Fr-, by employing four-component relativistic many-body methods. Differences in the results are shown by considering Dirac-Coulomb (DC) Hamiltonian, DC Hamiltonian with the Breit interaction, and DC Hamiltonian with the lower-order quantum electrodynamics interactions. At first, these interactions are included self-consistently in the Dirac-Hartree-Fock (DHF) method, and then electron correlation effects are incorporated over the DHF wave functions in the second-order many-body perturbation theory, random phase approximation and coupled-cluster (CC) theory. Roles of electron correlation effects and relativistic corrections are analyzed using the above many-body methods with size of the ions. We finally quote precise values of αd of the above negative ions by estimating uncertainties to the CC results, and compare them with other calculations wherever available.
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