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Dynamics and kinetics of oxygen dissociative adsorption on Pt{110}(1 × 2)

J. Chem. Phys. 109, 6879 (1998); doi:10.1063/1.477255

Issue Date: 22 October 1998

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A. V. Walker, B. Klötzer, and D. A. King
Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge, United Kingdom
The interaction of oxygen with Pt{110}(1 × 2) has been investigated using supersonic molecular beams and low-energy electron diffraction (LEED) at incident kinetic energies of 60–900 meV and surface temperatures from 170 to 1100 K. LEED studies indicate that at low exposures and low beam energies (< 190 meV) oxygen does not induce a reconstruction to (1 × 1). However at high exposures and low beam energies, a variable unit mesh dimension Frenkel–Kontorova domain structure is observed. Sticking probability measurements on the clean surface indicate that oxygen dissociative adsorption on Pt{110}(1 × 2) is a predominantly precursor mediated process. At low surface temperatures (< 200 K) and low beam energies, the precursor has a strong influence on the adsorption kinetics, and mixed islands of dioxygen and adatoms are formed. Adsorption at beam temperatures below 880 K produces two states in the the thermal desorption spectroscopy spectra, but at higher incident gas temperatures a new high temperature desorption state (Tp = 1020 K) can be populated, which inhibits the formation of the usual dissociatively chemisorbed states at Tp = 720 and 820 K. ©1998 American Institute of Physics.
History: Received 7 April 1998; accepted 21 July 1998
Permalink: http://link.aip.org/link/?JCPSA6/109/6879/1
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KEYWORDS and PACS

Keywords
PACS
  • 82.65.Jv
    Physical chemistry Surface and interface chemistry Heterogeneous catalysis at surfaces
  • 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)
  • 68.45.Da
    Surfaces and interfaces; thin films and whiskers (structure and nonelectronic properties) Solidfluid interfaces Adsorption and desorption kinetics; evaporation and condensation
  • 82.20.-w
    Physical chemistry Chemical kinetics
  • YEAR: 1998

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PUBLICATION DATA

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