Relativistic configuration-interaction calculation of the polarizabilities of heliumlike ions

摘要: Polarizabilities of ions the helium isoelectronic sequence with nuclear charges in range 2\ensuremath{\le}Z\ensuremath{\le}30 are evaluated starting from relativistic no-pair Hamiltonian and including both Coulomb Breit interactions. The ground state perturbed wave functions expanded two-electron basis constructed B splines. For each ion, ground-state function is determined by a configuration interaction calculation; then found solving an inhomogeneous algebraic equation. Nonrelativistic calculations carried out parallel calculations, permitting corrections to be isolated. present nonrelativistic good agreement other precise calculations. experimentally interesting case heliumlike lithium, we obtain value \ensuremath{\Delta}${\mathrm{\ensuremath{\alpha}}}_{\mathrm{Rel}}$=-(4.50\ifmmode\pm\else\textpm\fi{}0.05)\ifmmode\times\else\texttimes\fi{}${10}^{\mathrm{\ensuremath{-}}5}$ a.u. for correction polarizability. \textcopyright{} 1996 American Physical Society.