Spatiotemporal patterns of external noise-induced transitions in a bistable reaction-diffusion system : Photoelectron emission microscopy experiments and modeling

The rate of CO oxidation on Ir(111) surfaces exhibits bistability at T=500 K in a range of the CO fraction Y in the CO+O reactant gas flux. Measured CO2 rates as a function of the noise strength imposed on Y are well reproduced by parameter-free modeling. We present photoelectron emission microscopy...

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Bibliographic Details
Published in:Physical review letters 2005-07, Vol.95 (3), p.038301.1-038301.4, Article 038301
Main Authors: WEHNER, Stefan, HOFFMANN, Patrick, SCHMEISSER, Dieter, BRAND, Helmut R, KÜPPERS, Jurgen
Format: Article
Language:English
Subjects:
Catalysis
Chemistry
Exact sciences and technology
General and physical chemistry
Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry
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Summary:The rate of CO oxidation on Ir(111) surfaces exhibits bistability at T=500 K in a range of the CO fraction Y in the CO+O reactant gas flux. Measured CO2 rates as a function of the noise strength imposed on Y are well reproduced by parameter-free modeling. We present photoelectron emission microscopy measurements and 2D calculations of the spatiotemporal patterns of CO- and O-rich domains. The role of combined multiplicative and additive noise on Y for CO and O domain wall motion and island nucleation-growth-coalescence processes is analyzed.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.95.038301