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\ifmmode\times\else\texttimes\fi{}${10}^{\ensuremath{-}24}$ ${\mathrm{cm}.}^{3}$ The effects of electron correlations are discussed. The monopole and dipole contributions to the polarization potential are presented for the ${(2p)}^{3} ^{4}S 3s ^{5}S$ state.