PubMed · 8516142
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S Holmes. Building blocks.. https://pubmed.ncbi.nlm.nih.gov/8516142/
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The last 2 decades have seen discoveries in highly excited states of atoms and molecules of phenomena that are qualitatively different from the "planetary" model of the atom, and the near-rigid model of molecules, characteristic of these systems in their low-energy states. A unified view is emerging in terms of approximate dynamical symmetry principles. Highly excited states of two-electron atoms display "molecular" behavior of a nonrigid linear structure undergoing collective rotation and vibration. Highly excited states of molecules described in the "standard molecular model" display normal mode couplings, which induce bifurcations on the route to molecular chaos. New approaches such as rigid-nonrigid correlation, vibrons, and quantum groups suggest a unified view of collective electronic motion in atoms and nuclear motion in molecules.
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