Abstract
The ground state of the van der Waals-type lanthanide dimer Yb2 has been studied by means of relativistic energy-consistent ab initio pseudopotentials using three different core definitions. Electron correlation was treated by coupled-cluster theory, whereby core-valence correlation effects have been accounted for either explicitly by correlating the energetically highest coreorbitals or implicitly by means of an effective core-polarization potential. Results for the first and second atomic ionization potentials, the atomic dipole polarizability, and the spectroscopic constants of the molecular ground state are reported. Low-lying excited states have been investigated with spin-orbit configuration interaction calculations. It is also demonstrated for the whole lanthanide series that correlation effects due to the atomic-like, possibly open 4f-shell in lanthanides can be modeled effectively by adding a core-polarization potential to pseudopotentials attributing the 4f-shell to the core.
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Received: 3 April 1998 / Accepted: 27 July 1998 / Published online: 9 October 1998
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Wang, Y., Dolg, M. Pseudopotential study of the ground and excited states of Yb2. Theor Chem Acc 100, 124–133 (1998). https://doi.org/10.1007/s002140050373
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DOI: https://doi.org/10.1007/s002140050373