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Journal Article

Travelling fronts of the CO oxidation on Pd(111) with coverage-dependent diffusion


Karpitschka,  Stefan
Group Fluidics in heterogeneous environments, Department of Dynamics of Complex Fluids, Max Planck Institute for Dynamics and Self-Organization, Max Planck Society;

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Cisternas, J., Karpitschka, S., & Wehner, S. (2014). Travelling fronts of the CO oxidation on Pd(111) with coverage-dependent diffusion. The Journal of Chemical Physics, 141: 164106. doi:10.1063/1.4898705.

Cite as: https://hdl.handle.net/11858/00-001M-0000-002D-D5F4-4
In this work, we study a surface reaction on Pd(111) crystals under ultra-high-vacuum conditions that can be modeled by two coupled reaction-diffusion equations. In the bistable regime, the reaction exhibits travelling fronts that can be observed experimentally using photo electron emission microscopy. The spatial profile of the fronts reveals a coverage-dependent diffusivity for one of the species. We propose a method to solve the nonlinear eigenvalue problem and compute the direction and the speed of the fronts based on a geometrical construction in phase-space. This method successfully captures the dependence of the speed on control parameters and diffusivities.