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 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.
Wehner
Stefan
S
Experimentalphysik III, Universität Bayreuth, 95440 Bayreuth, Germany. stefan.wehner@uni-bayreuth.de
Hoffmann
Patrick
P
Schmeisser
Dieter
D
Brand
Helmut R
HR
Küppers
Jürgen
J