Electronic energies of americium from multiconfiguration Dirac-Fock calculations.

Abstract

A sophisticated theoretical description of the electronic states of americium has been hindered by the need to treat the half-filled 5f shell. We present here ab initio calculations for americium on a multiconfiguration Dirac-Fock level. The calculations were possible because only the dominant configuration state functions were used. The results give a reasonable description of the energy of the electronic ground states for the various total angular momenta and parity of americium. The results indicate some corrections for the spectroscopic assignments. \textcopyright{} 1996 The American Physical Society.