Sternheimer valence shielding and antishielding factors for several2pand3patoms and ions

Abstract

The Sternheimer valence shielding and antishielding factor R has been calculated for the isoelectronic series of atoms in 2p 1 , 2p 2 , 2p 4 , 2p 5 , 3p 1 , 3p 4 , and 3p 5 electronic configurations by means of the uncoupled numerical Hartree-Fock method. A slightly larger shielding effect is observed for the 1 D state relative to the 3 P state for N − , O, and S. In the 2p 4 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.