Atomic polarisabilities and polarised pseudostates in the multiconfigurational approach. III. Second-row atoms and ions

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For pt.II see ibid., vol.10, no.6, p.1015 (1977). Mean static dipole polarisabilities are calculated for the ground states of neutral atoms from Al to Cl and for singly ionised Si+ to Ar+. The polarisability is expressed in terms of the first-order correction in the wavefunction (due to the static electric dipole perturbation) which is determined variationally as a configuration interaction expansion. Near-degeneracy effects are included. The results are comparable with those obtained from the coupled Hartree-Fock scheme. The first-order wavefunctions may be used as target pseudostates in electron-atom scattering.