We use perturbed relativistic coupled-cluster (PRCC) theory to compute theelectric dipole polarizabilities $\alpha$ of Zn, Cd and Hg. The computationsare done using the Dirac-Coulomb-Breit Hamiltonian with Uehling potential toincorporate vacuum polarization corrections. The triple excitations areincluded perturbatively in the PRCC theory, and in the unperturbed sector, itis included non-perturbatively. Our results of $\alpha$, for all the threeelements, are in excellent agreement with the experimental data. The otherhighlight of the results is the orbital energy corrections from Breitinteractions. In the literature we could only get the data of Hg {E. Lindrothet al., J. Phys. B 22, 2447 (1989)} and are near perfect match with ourresults. We also present the linearized equations of the cluster amplitudes,including the triple excitations, with the angular factors.
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