Abstract
The Fock-space coupled-cluster method, a powerful and efficient scheme for the incorporation of electron correlation in atomic and molecular systems, is described, and representative applications are reviewed. The molecular potentials of alkali-metal dimers in their ground and excited states are calculated. A relativistic coupled-cluster method, starting from the four-component DiracCoulomb-Breit Hamiltonian, is applied to calculate transition energies of heavy atoms (Au is given as an example) and to determine the ground-state configurations (not known experimentally) of the superheavy elements 104 and 111. These are found to be different from the ground states of elements above them in the periodic table, due to relativistic effects. Finally, using a Douglas-Kroll transformation of the relativitic wave function, the potential function of AuH is investigated. Very good agreement with known experimental data is obtained in all cases. Large relativistic effects on the structure and spectra of heavy atoms and molecules are observed. Nonadditivity of relativistic and correlation energies is demonstrated.
Supported by the U.S.-Israel Binational Science Foundation and by the German-Israeli Foundation for Scientific Research and Development
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Kaldor, U. (1995). Molecular Potentials and Relativistic Effects. In: Guardiola, R. (eds) Few-Body Problems in Physics ’95. Few-Body Systems, vol 8. Springer, Vienna. https://doi.org/10.1007/978-3-7091-9427-0_9
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DOI: https://doi.org/10.1007/978-3-7091-9427-0_9
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