Sternheimer valence shielding and antishielding factors for several 2p and 3p atoms and ions

Abstract

The Sternheimer valence shielding and antishielding factor R has been calculated for the isoelectronic series of atoms in 2p¹, 2p², 2p⁴, 2p⁵, 3p¹, 3p⁴, and 3p⁵ electronic configurations by means of the uncoupled numerical Hartree-Fock method. A slightly larger shielding effect is observed for the ¹D state relative to the ³P state for N⁻, O, and S. In the 2p⁴ series, where N⁻ is included, it is found that the mononegative ion is characterized by an R which is twice as large as that for the isoelectronic neutral atom. The general trends observed in the variation of R within an isoelectronic series are discussed.