  Molecular structure is often considered as emerging from the decoherence
effect of the environment. Electrons are part of the environment of the nuclei
in a molecule. In this work, their contribution to the classical-like
geometrical relationships often observed between nuclei in molecular systems is
investigated. Reduced density matrix (RDM) elements are evaluated from
electron-nucleus wave functions. The computational results show that the
electrons play a role in the localization of the nuclei around specific
geometries. Although the electronic environment alone cannot explain molecular
symmetry-broken isomers, it can contribute to their dynamical stability by
reducing off-diagonal RDM elements.
