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Low-energy methane scattering from Pt(111).

Takahiro Kondo1, Amjad Al Taleb2, Gloria Anemone2

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We studied methane scattering from platinum, finding that increasing surface temperature shifts the scattering pattern. This reveals details about the molecule-surface interaction potential.

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Area of Science:

  • Surface Science
  • Chemical Physics
  • Materials Science

Background:

  • Understanding molecule-surface interactions is crucial for catalysis and materials design.
  • Methane (CH4) scattering from platinum (Pt) surfaces provides insights into gas-surface dynamics.

Purpose of the Study:

  • To investigate the temperature dependence of methane scattering from a Pt(111) surface.
  • To determine the effect of surface temperature on the angular distribution of scattered methane.
  • To analyze the corrugation of the methane-platinum interaction potential.

Main Methods:

  • Experimental measurement of methane angular distributions scattered from Pt(111) at 109 meV incident energy.
  • Systematic variation of surface temperature from 120 K to 800 K.
  • Theoretical analysis using a binary collision model to interpret scattering data.

Main Results:

  • Broad angular distributions were observed along high-symmetry directions.
  • The peak center shifted from supra-specular to sub-specular with increasing temperature.
  • Anisotropic scattering widths indicated different potential corrugations along [100] and [110] azimuthal directions.
  • The CH4-Pt(111) interaction potential corrugation was estimated at ~0.03 Å, significantly larger than helium diffraction results.

Conclusions:

  • Surface temperature strongly influences methane scattering dynamics from Pt(111).
  • The observed temperature dependence and anisotropy reveal significant corrugation in the methane-platinum interaction potential.
  • The binary collision model effectively explains the experimental observations, highlighting the importance of potential anisotropy.