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Quantum diffusion of H on Pt(111): step effects.

C Z Zheng1, C K Yeung, M M T Loy

  • 1Department of Physics and Institute of Nano Science and Technology, Hong Kong University of Science & Technology, Hong Kong, China.

Physical Review Letters
|December 13, 2006
PubMed
Summary

Quantum tunneling drives hydrogen diffusion on platinum surfaces at low temperatures. Surface defects significantly impact this quantum diffusion by creating varied adsorption sites, influencing hydrogen movement.

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Area of Science:

  • Surface Science
  • Quantum Mechanics
  • Materials Science

Background:

  • Hydrogen diffusion on metal surfaces is crucial for catalysis.
  • Quantum effects, like tunneling, can influence atomic motion at low temperatures.
  • Surface defects are known to affect material properties and reactivity.

Purpose of the Study:

  • To investigate the impact of surface defects on quantum surface diffusion of hydrogen.
  • To understand the role of quantum tunneling in hydrogen diffusion on platinum (Pt)(111) surfaces.
  • To correlate surface defect characteristics with diffusion behavior.

Main Methods:

  • Utilized a linear optical diffraction technique for systematic investigation.
  • Studied hydrogen diffusion on well-defined Pt(111) surfaces.
  • Analyzed diffusion coefficients at low temperatures.

Main Results:

  • Observed clear evidence of quantum tunneling for hydrogen diffusion.
  • Diffusion coefficient plateaued at low temperatures on flat surfaces, indicating tunneling.
  • Demonstrated a strong influence of surface defects on quantum diffusion behavior.

Conclusions:

  • Quantum tunneling is a significant mechanism for hydrogen diffusion on Pt(111) at low temperatures.
  • Surface defects create an inhomogeneous surface with varying adsorption energies, strongly influencing quantum diffusion.
  • The findings provide insights into defect-mediated quantum phenomena in surface diffusion.