Abstract
High-accuracy ground- and excited-state energies of heavy and superheavy atoms are calculated in the framework of the Dirac-CoulombBreit Hamiltonian. Electron correlation is treated by the Fock-space coupled cluster method. Several variants of the recently developed intermediate Hamiltonian approach are also described. These schemes make possible much larger P (model) spaces, which may be varied to convergence without encountering intruder state problems, thus enhancing accuracy and allowing application to states not accessible before. In particular, the mixed-sector IH scheme suppresses intruder states coming from higher Fock space sectors, making it possible to use quasi-closed shells (p2, d4 etc.) as reference. Very large basis sets, going up to l= 8, are used. The outer 20–40 electrons are correlated. Representative applications are described, showing excellent agreement with experimentally known transition energies of heavy atoms, usually within a few hundredths of an eV. This makes possible reliable predictions for superheavy elements, found to possess chemical and spectroscopic properties significantly different from their lighter homologues.
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Kaldor, U., Eliav, E., Landau, A. (2004). Study of Heavy Elements by Relativistic Fock Space and Intermediate Hamiltonian Coupled Cluster Methods. In: Brändas, E.J., Kryachko, E.S. (eds) Fundamental World of Quantum Chemistry. Springer, Dordrecht. https://doi.org/10.1007/978-94-017-0448-9_17
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