The Z−1 Expansion of the Nuclear Magnetic Shielding Constant and X-Ray Form Factor for 2-, 3-, and 4-Electron Ions

Abstract

The convergence of the Z−1 expansion of the nuclear magnetic shielding constant σ and the X-ray form factor F(μ) is studied within the Hartree–Fock (HF) approximation for the ground states of 2-, 3-, and 4-electron atoms and ions. The agreement of σ through first order with the total HF σ is excellent, whereas the agreement between first-order and total HF F(μ)'s is unsatisfactory.