Atomic polarizabilities and polarized pseudo-states in the multiconfigurational approach. II. First row atoms and ions

For pt.I see ibid., vol.9, p.1065 (1976). Mean static dipole polarizabilities are calculated for the ground states of neutral and singly ionized atoms from Be to Ne. The polarizability is expressible in terms of the second-order energy correction in a formalism with the static dipole field being treated as a perturbation. The radial functions used in the calculation are determined by treating this second order energy as a variational functional, rather than by using the unperturbed atom variational principle. Because of this, the use of quite simple wavefunctions gives results which compare well with the much larger-scale calculations also performed.