Many-Body Perturbation-Theory Calculation of Atomic Polarizabilities

Abstract

The use of many-body perturbation theory in problems involving multiple perturbations is discussed. The perturbation theory is applied to the calculation of the dipole polarizability of the ground state and of a number of low-lying excited states for atomic oxygen. For the ${}_{}{}^3{}_{}{}^{}P$ ground state, the calculated polarizability is 0.783×${10}^{-24\mathrm{}}$ ${\mathrm{cm}.\mathrm{}}^3$ The effects of electron correlations are discussed. The monopole and dipole contributions to the polarization potential are presented for the ${\mathrm{}\left(2p\right)\mathrm{}}^3 {}_{}{}^4{}_{}{}^{}S 3s {}_{}{}^5{}_{}{}^{}S$ state.