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Cold collisions catalyse conformational conversion.

Undine Erlekam1, Marcin Frankowski, Gert von Helden

  • 1Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, D-14195, Berlin, Germany. erlekam@fhi-berlin.mpg.de

Physical Chemistry Chemical Physics : PCCP
|July 12, 2007
PubMed
Summary
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Researchers controlled the formation of mixed benzene dimer conformers using carrier gases. Low-energy collisions selectively produced the lowest energy structure in molecular beams.

Area of Science:

  • Physical Chemistry
  • Molecular Spectroscopy
  • Chemical Physics

Background:

  • Benzene dimers exhibit complex conformational landscapes.
  • Understanding conformer populations is crucial for molecular interactions.
  • Previous studies lacked precise control over dimer structures.

Purpose of the Study:

  • To determine the abundance of different mixed benzene dimer conformers.
  • To investigate the influence of carrier gases on conformer populations.
  • To elucidate the mechanism controlling conformer selectivity.

Main Methods:

  • Generation of mixed benzene dimers (C(6)H(6))(C(6)D(6)) in a molecular beam.
  • Utilizing various carrier gases (e.g., He, Ne, Ar, Kr).
  • Analysis of conformer populations based on spectroscopic data.

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Main Results:

  • Two distinct T-shaped conformers of the mixed benzene dimer were identified.
  • A subtle zero-point energy difference exists between the conformers.
  • Carrier gas choice exclusively determined the population of the lowest energy conformer.
  • Low-energy collisions with carrier gas atoms were identified as the key factor.

Conclusions:

  • Conformer-selective preparation of mixed benzene dimers is achievable.
  • Collisional cooling in molecular beams plays a critical role in controlling molecular structure.
  • This work provides insights into controlling isomeric abundance in van der Waals clusters.