We use photoelectron emission microscopy (PEEM) measurements to study the spatiotemporal patterns obtained for the $\mathrm{CO}$ oxidation reaction on $\mathrm{Ir}\left(111\right)$ as a function of the noise strength we superpose on the $\mathrm{CO}$ and the oxygen fractions of the constant total reactant gas flux. The investigations are focused on the bistable regime this reaction displays including its monostable vicinity. Simultaneously we analyze numerically the underlying reaction-diffusion (RD) equations in two spatial dimensions. For intrinsic and/or small strength of the external noise we find transitions from the locally stable to the globally stable branch via slow nucleation and growth of islands of the globally stable state: oxygen or $\mathrm{CO}$, respectively. With increasing noise strength the number of islands as well as their growth rate increases. These phenomena are very well reproduced by numerical calculations of the RD model. For sufficiently large noise strength we observe bursts from $\mathrm{CO}$ rich to oxygen rich and back as well as switching between the two states. While such phenomena are also obtained from the model calculations, their experimentally observed spatial scales were not satisfactorily reproduced using the same approach as for the lower noise strengths.

• Received 24 January 2006

DOI:https://doi.org/10.1103/PhysRevE.73.056123