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External noise imposed on the reaction-diffusion system CO+O2→CO2 on Ir(111) surfaces: Experiment and theory

Yumino Hayase1,2,*, Stefan Wehner3, Jürgen Küppers3,4, and Helmut R. Brand1

  • 1Theoretische Physik III, Universität Bayreuth, 95440 Bayreuth, Germany
  • 2Department of Physics, Kyushu University, Fukuoka 812-8581, Japan
  • 3Experimentalphysik III, Universität Bayreuth, 95440 Bayreuth, Germany
  • 4Max-Planck-Institut für Plasmaphysik, 85748 Garching, Germany

  • *Email address: yumino@stat.phys.kyushu-u.ac.jp
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Phys. Rev. E 69, 021609 – Published 27 February, 2004

DOI: https://doi.org/10.1103/PhysRevE.69.021609

Abstract

We study experimentally and theoretically the influence of noise on the fractions of CO and oxygen in the constant gas flow directed at an Ir(111) surface during CO oxidation. Depending on the noise strength and the fraction Y of CO we observe in the deterministically bistable region a large variety of different types of behavior. These include bistable behavior for small noise intensities, transitions from the upper to the lower branch of the bistable loop and vice versa, island nucleation and growth and noise-induced switching. Near the boundary of the bistable region and in the presence of noise the transition between the two branches takes place via very slow domain wall motion with time scales of the order of 104–105s. The experiments were carried out in an UHV system for which the mass flow could be controlled very precisely. The modeling was using the reaction-diffusion system underlying the reaction studied for which all the kinetic coefficients are known rather precisely. Our numerical analysis was performed for one and two spatial dimensions showing qualitatively similar behavior. The comparison between the experimental results and the modeling shows semiquantitative to quantitative agreement.

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Phys. Rev. E 69, 021609– Published 27 February, 2004
  • Received 3 September 2003

© 2004 American Physical Society

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