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

Jaime Cisternas, Stefan Karpitschka, Stefan Wehner

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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.

Original languageEnglish
Article number164106
JournalJournal of Chemical Physics
Issue number16
StatePublished - 28 Oct 2014

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