On the interpretation of Hund's rules in atomic spectra

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Abstract
Term splittings calculated from multiconfiguration self-consistent field models (both relativistic and non-relativistic) have been analysed by several methods. Recent studies by Davidson (1962), Katriel (1972), Colpa (1973) have suggested that the empirical rules of Hund relating to term splittings may be interpreted largely in terms of changes in the total electron-nuclear attraction. It is shown that a more consistent description can be given in terms of the traditional picture of the motion of valence electrons in the field of the nucleus and an essentially frozen electron core.