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Spatial Separation of Molecular Conformers and Clusters
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Published on: January 9, 2014

Dark structures in molecular radiationless transitions determined by ultrafast diffraction.

Ramesh Srinivasan1, Jonathan S Feenstra, Sang Tae Park

  • 1Laboratory for Molecular Sciences, Arthur Amos Noyes Laboratory of Chemical Physics, Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, CA 91125, USA.

Science (New York, N.Y.)
|January 8, 2005
PubMed
Summary

Researchers directly observed transient "dark" structures during radiationless transitions in aromatic molecules using ultrafast electron diffraction. This revealed unexpected dynamics, including substituent-dependent ring opening and bifurcating pathways.

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Area of Science:

  • Physical Chemistry
  • Chemical Physics
  • Molecular Dynamics

Background:

  • Radiationless transitions are key processes in photochemistry.
  • Intermediate structures, termed "dark" states, are difficult to study directly.
  • Understanding these states is crucial for controlling chemical reactions.

Purpose of the Study:

  • To directly determine transient molecular structures during radiationless transitions.
  • To investigate the role of molecular substituents in these dynamics.
  • To elucidate competing nonradiative pathways.

Main Methods:

  • Ultrafast electron diffraction (UED) with high spatial and temporal resolution.
  • Direct observation of transient structures on potential energy surfaces.
  • Analysis of bond breaking, vibronic coupling, and spin transitions.

Main Results:

  • Directly observed "dark" intermediate structures in aromatic molecules.
  • Revealed unexpected dynamical behaviors, including substituent-dependent ring opening.
  • Identified parallel bifurcation into physical and chemical reaction channels.

Conclusions:

  • UED provides unprecedented insight into ultrafast molecular dynamics.
  • Molecular substituents significantly influence ring-opening dynamics.
  • Radiationless processes involve complex, bifurcating pathways that redefine energy landscape dynamics.