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Hybridization of Atomic Orbitals II

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Microscopic Visualization of Porous Nanographenes Synthesized through a Combination of Solution and On-Surface Chemistry
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Extended atomic hydrogen dimer configurations on the graphite(0001) surface.

Z Sljivancanin1, E Rauls, L Hornekaer

  • 1Interdisciplinary Nanoscience Center (iNANO) and Department of Physics and Astronomy, University of Aarhus, DK 8000 Aarhus C, Denmark.

The Journal of Chemical Physics
|September 4, 2009
PubMed
Summary
This summary is machine-generated.

We found that hydrogen dimers on graphite surfaces have stronger bonds due to interactions. Molecular hydrogen formation occurs through diffusion, not direct desorption, from these dimer structures.

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Area of Science:

  • Surface science
  • Physical chemistry
  • Materials science

Background:

  • Understanding hydrogen adsorption and interactions on surfaces is crucial for catalysis and materials development.
  • Graphite surfaces are widely studied as model systems for heterogeneous reactions.

Purpose of the Study:

  • To investigate the structures and kinetics of extended hydrogen dimer configurations on graphite (0001).
  • To elucidate the binding energies, adsorption barriers, and diffusion pathways of hydrogen dimers.

Main Methods:

  • Density functional theory (DFT) calculations were employed to model hydrogen-graphite interactions.
  • Scanning tunneling microscopy (STM) experiments were conducted to observe and verify hydrogen dimer structures.

Main Results:

  • Several stable hydrogen dimer structures were identified, with increased binding energies due to surface-mediated interactions, even at large separations (up to 7 Å).
  • The adsorption of a second hydrogen atom onto a surface with a pre-adsorbed atom showed decreased sticking barriers compared to adsorption on a clean surface.
  • Activation energies for single hydrogen atom desorption from observed dimers were found to be higher than diffusion barriers to a specific 'paradimer' configuration.

Conclusions:

  • Surface-mediated interactions significantly stabilize extended hydrogen dimers on graphite.
  • Molecular hydrogen formation from these extended dimers primarily occurs via diffusion to the paradimer configuration, followed by desorption, rather than direct desorption from the dimer.