Complex patterns in a periodically forced surface reaction

Bertram, Matthias; Beta, Carsten; Rotermund, Harm H.; Ertl, Gerhard

doi:10.1021/jp0341927

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Complex patterns in a periodically forced surface reaction

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Bertram, Matthias
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Beta, Carsten
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Rotermund, Harm H.
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Ertl, Gerhard
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Citation

Bertram, M., Beta, C., Rotermund, H. H., & Ertl, G. (2003). Complex patterns in a periodically forced surface reaction. Journal of Physical Chemistry B, 107(35), 9610-9615. doi:10.1021/jp0341927.

Cite as: https://hdl.handle.net/11858/00-001M-0000-0011-0F88-0

Abstract

Effects of time-periodic, spatially uniform forcing on oscillatory chemical turbulence are studied in experiments with catalytic CO oxidation on a platinum(110) single-crystal surface. A variety of complex spatiotemporal reaction-diffusion patterns is investigated under variation of the forcing amplitude and frequency. Near harmonic resonance with the forcing, intermittent turbulence characterized by the presence of localized turbulent bubbles on a homogeneously oscillating background and disordered cellular structures are observed. In the parameter region where the system exhibits 2:1 subharmonic resonance, irregular oscillatory stripes and cluster patterns are found. For such resonant patterns, a frequency demodulation technique is used to reconstruct phase and amplitude variables from the experimental data.