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Area of Science:

  • Surface science
  • Physical chemistry
  • Materials science

Background:

  • Understanding gas-surface interactions is crucial for catalysis and materials development.
  • The sticking probability of molecules on surfaces is influenced by various factors, including kinetic energy and molecular orientation.
  • Aluminum(111) is a well-studied surface in surface science due to its simple structure and reactivity.

Purpose of the Study:

  • To investigate the role of molecular alignment (steric effect) on the sticking probability of oxygen (O2) on an Aluminum(111) surface.
  • To determine the influence of O2 orientation on its dissociation barrier upon interaction with Al(111).

Main Methods:

  • Experimental measurement of O2 sticking probability using an aligned O2 molecular beam.
  • Preparation of the aligned O2 beam using a hexapole magnet.
  • Analysis of steric effects at translational energies below 0.2 eV.

Main Results:

  • Sticking probability of O2 on Al(111) is strongly dependent on molecular orientation relative to the surface.
  • O2 molecules predominantly stick to the Al(111) surface when their molecular axis is parallel to the surface.
  • The dissociation barrier for O2 on Al(111) is approximately 0.1 eV higher for perpendicular compared to parallel molecular orientation.

Conclusions:

  • Molecular alignment is a critical factor governing O2 sticking on Al(111).
  • The parallel orientation facilitates sticking, while the perpendicular orientation presents a higher dissociation barrier.
  • Abstraction reactions, favored in the perpendicular geometry, are minor pathways at low translational energies for O2 on Al(111).