Abstract
The results of a computational study with multiconfigurational quantum chemical methods on actinide monoxides (AnO) and dioxides (AnO(2)) for An = Th, Pa, U, Np, Pu, Am, and Cm, are presented. First and second ionization energies were determined and compared with experimental values, when available. The trend along the series is analyzed in terms of the electronic configurations of the various species. The agreement with experiment is excellent in most cases. Of particular interest is the first ionization of PuO(2). We applied cutting-edge theoretical methods to refine the ionization energy, but our computed data fall in the range of approximately 6 eV and not in the approximately 7 eV region as the experiment dictates. Such a system requires further computational and experimental attention.
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