Finding optimal radial-function parameters for S atoms in the Hansen–Coppens multipole model through refinement of theoretical densities

The multipolar model of the valence-electron-density distribution for sulfur has been optimized based on theoretical structure factors for six organic molecules. It is shown that: (a) the ratio of the n(l) values for different l is more important than their absolute values, and (b) the (2,4,6,8) set of n(l) with κ′ refined as a single value is an optimal choice of radial function parameters for S atoms.