Dynamical bottlenecks to intramolecular energy flow.

@article{Paskauskas2008DynamicalBT,
  title={Dynamical bottlenecks to intramolecular energy flow.},
  author={R. Andrew Paskauskas and Cristel Chandre and Turgay Uzer},
  journal={Physical review letters},
  year={2008},
  volume={100 8},
  pages={
          083001
        }
}
Vibrational energy flows unevenly in molecules, repeatedly going back and forth between trapping and roaming. We identify bottlenecks between diffusive and chaotic behavior, and describe generic mechanisms of these transitions, taking the carbonyl sulfide molecule OCS as a case study. The bottlenecks are found to be lower-dimensional tori; their bifurcations and unstable manifolds govern the transition mechanisms. 

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