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An Analog Macroscopic Technique for Studying Molecular Hydrodynamic Processes in Dense Gases and Liquids
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Published on: December 4, 2017

Surface diffusive motion in a periodic and asymmetric potential.

Greg Pawin1, Kin L Wong, Ki-Young Kwon

  • 1Pierce Hall, University of California, Riverside, California 92521, USA.

Journal of the American Chemical Society
|October 29, 2008
PubMed
Summary

9,10-Dithioanthracene diffusion on copper surfaces reveals surprising symmetry. Asymmetric methylation alters diffusion rates but not motion symmetry, challenging classical particle behavior and visualizing microscopic reversibility.

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Area of Science:

  • Surface science
  • Physical chemistry
  • Nanoscale dynamics

Background:

  • Understanding molecular diffusion on surfaces is crucial for catalysis and materials science.
  • The Principle of Microscopic Reversibility governs the statistical behavior of systems at equilibrium.
  • Visualizing nanoscale dynamics provides direct insights into fundamental physical principles.

Purpose of the Study:

  • To investigate the diffusion dynamics of 9,10-dithioanthracene on a Cu(111) surface.
  • To explore the effect of reduced symmetry on molecular diffusion and its underlying principles.
  • To provide a single-molecule-scale visualization of the Principle of Microscopic Reversibility.

Main Methods:

  • Adsorption of 9,10-dithioanthracene on a Cu(111) substrate.
  • Asymmetric methylation of the molecule to reduce system symmetry.
  • High-resolution surface microscopy techniques to observe diffusion.
  • Computational modeling to analyze diffusion barriers and rates.

Main Results:

  • 9,10-Dithioanthracene diffuses along high-symmetry axes on Cu(111).
  • Asymmetric methylation reduced diffusion rate by 100-fold and made the diffusion barrier asymmetric.
  • The symmetry of molecular motion remained unchanged despite system asymmetry.
  • Observed dynamics challenge classical particle diffusion expectations.

Conclusions:

  • Molecular diffusion symmetry can be maintained even with reduced system symmetry.
  • The study offers a direct, single-molecule visualization of the Principle of Microscopic Reversibility.
  • Findings highlight the quantum mechanical nature of nanoscale diffusion and its implications for fundamental physics.