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Suppression of spatiotemporal chaos in the oscillatory CO oxidation on Pt(110) by focused laser light

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Punckt,  Christian
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Citation

Punckt, C., Stich, M., Beta, C., & Rotermund, H. H. (2008). Suppression of spatiotemporal chaos in the oscillatory CO oxidation on Pt(110) by focused laser light. Physical Review E, 77(4): 046222. doi:10.1103/PhysRevE.77.046222.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0010-FCF9-9
Abstract
Chemical turbulence in the oscillatory catalytic CO oxidation on Pt(110) is suppressed by means of focused laser light. The laser locally heats the platinum surface which leads to a local increase of the oscillation frequency, and to the formation of a pacemaker which emits target waves. These waves slowly entrain the medium and suppress the spatiotemporal chaos present in the absence of laser light. Our experimental results are confirmed by a detailed numerical analysis of one- and two-dimensional media using the Krischer-Eiswirth-Ertl model for CO oxidation on Pt(110). Different control regimes are identified and the dispersion relation of the system is determined using the pacemaker as an externally tunable wave source.