@article{WehnerSchmeisserHoffmann, author = {Wehner, Stefan and Schmeißer, Dieter and Hoffmann, Patrick}, title = {Spatiotemporal patterns of external noise-induced transitions in a bistable reaction-diffusion system : Photoelectron Emission Microscopy experiments and modeling}, language = {en} } @article{HoffmannWehnerSchmeisser, author = {Hoffmann, Patrick and Wehner, Stefan and Schmeißer, Dieter}, title = {Noise-Induced Spatiotemporal Patterns in a Bistable Reaction-Diffusion System: Photoelectron Emission Microscopy experiments and Modeling of the CO Oxidation Reaction on Ir(111)}, language = {en} } @inproceedings{SchmeisserWehnerHoffmannetal., author = {Schmeißer, Dieter and Wehner, Stefan and Hoffmann, Patrick and Brand, Helmut R. and K{\"u}ppers, J{\"u}rgen}, title = {Influence of the Substrate on the Pattern Formation of a Surface Reaction}, series = {Nonequilibrium statistical mechanics and nonlinear physics, XV Conference on Nonequilibrium Statistical Mechanics and Nonlinear Physics, Mar del Plata, Argentina, 4 - 8 December 2006}, booktitle = {Nonequilibrium statistical mechanics and nonlinear physics, XV Conference on Nonequilibrium Statistical Mechanics and Nonlinear Physics, Mar del Plata, Argentina, 4 - 8 December 2006}, editor = {Descalzi, Orazio}, publisher = {AIP Publishing}, address = {Melville, New York}, isbn = {978-0-7354-0421-2}, pages = {121 -- 126}, language = {en} } @misc{HoffmannWehnerSchmeisseretal., author = {Hoffmann, Patrick and Wehner, Stefan and Schmeißer, Dieter and Brand, Helmut R. and K{\"u}ppers, J{\"u}rgen}, title = {Noise-induced spatiotemporal patterns in a bistable reaction-diffusion system: Photoelectron emission micrsoscopy experiments and modeling of the CO oxidation reaction on Ir(111)}, series = {Physical Review : E}, volume = {73}, journal = {Physical Review : E}, number = {5}, issn = {1550-2376}, pages = {056123}, language = {en} } @inproceedings{WehnerHoffmannSchmeisseretal., author = {Wehner, Stefan and Hoffmann, Patrick and Schmeißer, Dieter and Brand, Helmut R. and K{\"u}ppers, J{\"u}rgen}, title = {CO oxidation on Ir(111) surfaces: consequences of anisotropic diffusion and noise}, series = {Verhandlungen der Deutschen Physikalischen Gesellschaft, Reihe 6, Bd. 41}, booktitle = {Verhandlungen der Deutschen Physikalischen Gesellschaft, Reihe 6, Bd. 41}, publisher = {Deutsche Physikalische Gesellschaft}, address = {Bad Honnef}, issn = {0420-0195}, pages = {S. 475}, abstract = {The CO oxidation reaction on Iridium(111) surfaces shows bistability in a limited range of the CO fraction of the reactant gas flux Y and a wide range of temperatures T. The two branches are characterized by their reactivity for CO2 formation. The upper rate (high CO2 formation) rate is related to high oxygen coverage on the surface, the lower rate (little CO2 formation) to high CO coverage. Quadrupol mass spectroscopy and PEEM (photoelectron emission microscopy) was employed to study the influence of a noisy reactant gas flux composition on the spatio-temporal pattern development in the CO oxidation reaction on flat Ir(111) and stepped Ir(977) surfaces. PEEM shows nucleation and growth of few oxygen resp. CO islands at small noise amplitudes. Anisotropic diffusion of CO parallel and normal to the steps causes elliptic shapes of large islands. The long axes of the ellipses are aligned along the steps. At increased noise amplitudes the density of islands becomes larger. 2D modeling of the phenomena based on reaction-diffusion differential equations reproduces the experimental findings quite nicely.}, language = {en} }