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We present a comprehensive theoretical study of the electronic structures of the Yb atom and the Yb 2  molecule, respectively, focusing on their ground and lowest‐lying electronically excited states. Our study includes various state‐of‐the‐art quantum chemistry methods such as CCSD, CCSD(T), CASPT2 (including spin‐orbit coupling), and EOM‐CCSD as well as some recently developed pCCD‐based approaches and their extensions to target excited states. Specifically, we scan the lowest‐lying potential energy surfaces of the Yb 2  dimer and provide a reliable benchmark set of spectroscopic parameters including optimal bond lengths, vibrational frequencies, potential energy depths, and adiabatic excitation energies. Our in‐depth analysis unravels the complex nature of the electronic spectrum of Yb 2 , which is difficult to model accurately by any conventional quantum chemistry method. Finally, we scrutinize the bi‐excited character of the first       1    Σ  g  +    excited state and its evolution along the potential energy surface.

international journal of quantum chemistry

Modeling the electronic structures of the ground and excited states of the ytterbium atom and the ytterbium dimer: A modern quantum chemistry perspective