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Area of Science:

  • Surface Science
  • Chemical Physics
  • Materials Science

Background:

  • Understanding gas-surface interactions is crucial for catalysis and semiconductor manufacturing.
  • The sticking and dissociation of oxygen molecules (O2) on silicon surfaces are fundamental processes.
  • Previous studies lacked detailed insight into the role of O2 molecular orientation.

Purpose of the Study:

  • To experimentally investigate the influence of O2 molecular alignment on its reactivity with a Si(100)-(2×1) surface.
  • To provide the first direct evidence linking O2 molecular axis angles to its sticking probability.
  • To explore the role of surface steps in O2 dissociation.

Main Methods:

  • Utilizing a fully alignment-resolved O2 sticking experiment.
  • Employing a single domain Si(100)-(2×1) surface.
  • Comparing O2 sticking on both flat and vicinal Si(100) surfaces.

Main Results:

  • Demonstrated that O2 reactivity is dependent on both polar and azimuthal angles of the molecular axis.
  • Observed a 40% higher reactivity for O2 molecules oriented perpendicular to the Si dimer compared to parallel orientation during side-on collisions.
  • Identified barrierless dissociation channels at the double layer step on vicinal Si(100) surfaces.

Conclusions:

  • Molecular orientation is a critical factor governing O2 reactivity on Si(100).
  • Specific alignments, like side-on perpendicular to the dimer, significantly enhance O2 sticking and dissociation.
  • Surface steps, particularly double layer steps, facilitate O2 dissociation through low-energy pathways.