Electron Correlations and Quadrupole Hyperfine Structure of Li2P2

Abstract

A perturbation calculation, based on restricted Hartree-Fock approximation, is carried out to second order in the residual interaction for the electric field gradient at the nucleus of Li $2{}_{}{}^2{}_{}{}^{}P$. It is shown that the second-order wave function is not required for the calculation of the second-order correction. We find that the second-order correction is nearly equal and opposite to the first-order (Sternheimer) correction.