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Differential Imaging of Biological Structures with Doubly-resonant Coherent Anti-stokes Raman Scattering CARS
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Doubly charged coronene clusters-Much smaller than previously observed.

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|May 10, 2018
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Doubly charged coronene trimers (Cor32+) were observed, exceeding theoretical size limits. Calculations confirm a significant fission barrier, explaining their stability.

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Area of Science:

  • Physical Chemistry
  • Atomic and Molecular Physics
  • Materials Science

Background:

  • Doubly charged atomic and molecular clusters typically exhibit limited stability due to charge repulsion.
  • The Rayleigh limit predicts the size beyond which doubly charged clusters become unstable.
  • Previous studies reported doubly charged coronene clusters (Cor152+) significantly larger than this limit.

Purpose of the Study:

  • To investigate the stability of doubly charged coronene trimers (Cor32+).
  • To determine if coronene clusters possess unique properties allowing for enhanced stability beyond the Rayleigh limit.
  • To experimentally and theoretically assess the fission barriers of small doubly charged coronene clusters.

Main Methods:

  • Production of coronene clusters via electron ionization of helium nanodroplets doped with coronene.
  • Mass spectrometry for the detection and identification of cluster ions.
  • Density functional theory (DFT) calculations to estimate fission barrier heights.

Main Results:

  • Observation of doubly charged coronene trimers (Cor32+) using mass spectrometry.
  • Experimental evidence suggests a non-zero fission barrier for Cor32+ under experimental conditions.
  • DFT calculations indicate a sizeable fission barrier for Cor32+, consistent with experimental findings.
  • The stability of Cor32+ challenges conventional understanding based on the Rayleigh limit.

Conclusions:

  • Doubly charged coronene trimers exhibit unexpected stability, defying predictions based on the Rayleigh limit.
  • A significant fission barrier contributes to the stability of these larger doubly charged clusters.
  • Coronene clusters possess unique structural properties that enable the formation of stable dications beyond theoretical expectations.