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Dynamics of dissociative methane adsorption on metals: CH4 on Pt{110}(1×2)

J. Chem. Phys. 112, 4739 (2000); doi:10.1063/1.481030

Issue Date: 8 March 2000

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A. V. Walker and D. A. King
Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge, CB2 1EW, United Kingdom
Supersonic molecular beams have been used to study methane dissociative adsorption on Pt{110}(1×2) at incident translational energies of 20 to 700 meV, incident vibrational temperatures of 300 to 800 K and surface temperatures from 400 to 1000 K. At Et<=100 meV, the initial dissociative sticking probability, s0, rises sharply. The process is facilitated by vibrational excitation of the deformation modes and surface temperature. At Et>100 meV, an activated adsorption process becomes dominant, with an activation barrier of ~146 meV. At Et>=230 meV, s0 attains a limiting value which is strongly enhanced by excitation of the C–H stretch modes in the incident molecule. An increase in the surface temperature also enhances s0, at all incident translational energies. The mechanistic implications are discussed and it is concluded that the low translational energy process is a distinctive steering-assisted direct adsorption pathway. ©2000 American Institute of Physics.
History: Received 2 July 1999; accepted 14 December 1999
Permalink: http://link.aip.org/link/?JCPSA6/112/4739/1
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KEYWORDS and PACS

Keywords
PACS
  • 68.45.-v
    Surfaces and interfaces; thin films and whiskers (structure and nonelectronic properties) Solid–fluid interfaces
  • 82.65.My
    Physical chemistry Surface and interface chemistry Chemisorption
  • 82.30.Lp
    Physical chemistry Specific chemical reactions; reaction mechanisms Decomposition reactions (pyrolysis, dissociation, and group ejection)
  • 82.65.-i
    Physical chemistry Surface and interface chemistry
  • 82.40.Dm
    Physical chemistry Chemical kinetics and reactions: special regimes and techniques Atomic and molecular beam reactions
  • 34.50.Dy
    Atomic and molecular collision processes and interactions Scattering of atoms, molecules, and ions Interactions of atoms, molecules, and their ions with surfaces; photon and electron emission; neutralization of ions
  • 33.15.Mt
    Molecular properties and interactions with photons Properties of molecules and molecular ions Rotation, vibration, and vibration–rotation constants
  • 34.50.Ez
    Atomic and molecular collision processes and interactions Scattering of atoms, molecules, and ions Rotational and vibrational energy transfer
  • 68.45.Da
    Surfaces and interfaces; thin films and whiskers (structure and nonelectronic properties) Solid–fluid interfaces Adsorption and desorption kinetics; evaporation and condensation
  • YEAR: 2000

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PUBLICATION DATA

ISSN:
0021-9606 (print)   1089-7690 (online)
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