Studies of the Jahn-Teller effect .II. The dynamical problem

@article{LonguetHiggins1958StudiesOT,
  title={Studies of the Jahn-Teller effect .II. The dynamical problem},
  author={Hugh Christopher Longuet-Higgins and U. {\"O}pik and Maurice Henry Lecorney Pryce and Robert A. Sack},
  journal={Proceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences},
  year={1958},
  volume={244},
  pages={1 - 16}
}
This paper examines the vibronic energy levels of a symmetrical non-linear molecule in a spatially doubly degenerate electronic state which is split in first order by a doubly degenerate vibrational mode. The vibronic levels are classified by a quantum number, which in certain cases is formally related to the combined angular momentum of electronic and vibrational motion, and numerical values are obtained for the energies of these levels as functions of this quantum number and a dimensionless… 

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