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A molecular beam study of nonlinearity in the CO-induced surface restructuring of Ir{100}

J. Chem. Phys. 109, 10996 (1998); doi:10.1063/1.477738

Issue Date: 22 December 1998

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T. Ali, B. Klötzer, A. V. Walker, and D. A. King
Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, United Kingdom
The kinetics of CO chemisorption on both the (1 × 5) and (1 × 1) surfaces of Ir{100}, including the CO-induced surface restructuring process, have been studied by measuring the sticking probability as a function of the surface temperature and beam flux. Due to competition between desorption from the (1 × 5) phase and growth of (1 × 1) islands, the sticking probability on the initial (1 × 5) surface is strongly flux-dependent at surface temperatures Ts in the range 480 <= Ts <= 510 K. It is shown that this is due to a strongly nonlinear dependence of the (1 × 1) growth rate on the local CO coverage on the (1 × 5) substrate, with an apparent reaction order of around 5. Desorption energies and pre-exponentials of desorption for CO from both the (1 × 1) and (1 × 5) surfaces have been determined by means of a modified lifetime measurement technique. Equilibrium coverages as well as isothermal desorption rates of CO were determined for both surface phases. The zero coverage desorption energy of CO from the (1 × 1) substrate is 196 ± 5 kJ/mol and from the (1 × 5) surface it is around 150 kJ/mol. This difference in adsorption energies is the driving force for the CO-induced (1 × 5) to (1 × 1) phase transition. TEAS data show that the local CO coverage on the growing (1 × 1) islands during the phase transformation is 0.5 ML. ©1998 American Institute of Physics.
History: Received 10 August 1998; accepted 18 September 1998
Permalink: http://link.aip.org/link/?JCPSA6/109/10996/1
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KEYWORDS and PACS

Keywords
PACS
  • 68.45.Da
    Surfaces and interfaces; thin films and whiskers (structure and nonelectronic properties) Solidfluid interfaces Adsorption and desorption kinetics; evaporation and condensation
  • 82.65.My
    Physical chemistry Surface and interface chemistry Chemisorption
  • 68.35.Rh
    Surfaces and interfaces; thin films and whiskers (structure and nonelectronic properties) Solid surfaces and solidsolid interfaces Phase transitions and critical phenomena
  • 79.20.Rf
    Electron and ion emission by liquids and solids; impact phenomena Impact phenomena (including electron spectra and sputtering) Atomic, molecular, and ion beam impact and interactions with surfaces
  • YEAR: 1998

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