Carbon monoxide oxidation on Iridium(111) surfaces under colored noise

Jaime Cisternas*, Daniel Escaff, Orazio Descalzi, Stefan Wehner

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

4 Scopus citations


We study the effect of external noise on the catalytic oxidation of CO on an Iridium(111) single crystal under ultrahigh vacuum conditions. This reaction can be considered as a model of catalysis used in the industry. In the absence of noise, the reaction exhibits one or two stable stationary states, depending on the control parameters such as temperature and partial pressures. When noise is added, for instance, by randomly varying the quality of the influx mixture, the system exhibits stochastic reaction rate and switching. In this work, we present the theoretical predictions for the bistable situation using a number of colored-noise approximations that consider the intensity and correlation of the external fluctuations. As we will show, only some of these approximations are suitable for bistable systems.

Original languageEnglish
Pages (from-to)243-254
Number of pages12
JournalInternational Journal of Bifurcation and Chaos in Applied Sciences and Engineering
Issue number2
StatePublished - Feb 2010

Bibliographical note

Funding Information:
We thank H.R. Brand and P. Hänggi for valuable clarifications. J. Cisternas and O. Descalzi are supported by Fondecyt Grant 1070098. J. Cisternas and D. Escaff are supported by Universidad de los Andes Grant (2009). S. Wehner’s visit to Santiago was supported by Fondecyt Grant 7070052.


  • Bistability
  • Colored noise
  • Stochastic processes
  • Surface reactions


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