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Updated: Aug 16, 2026

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Published on: February 16, 2024
Spatiotemporal patterns of external noise-induced transitions in a bistable reaction-diffusion system: photoelectron
Stefan Wehner1, Patrick Hoffmann, Dieter Schmeisser
1Experimentalphysik III, Universität Bayreuth, 95440 Bayreuth, Germany. stefan.wehner@uni-bayreuth.de
Abstract:
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.
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