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Free keywords:
carbon compounds; chaos; circadian rhythms; dispersion relations; laser beams; numerical analysis; optical focusing; oxidation; platinum; spatiotemporal phenomena; Reflection Anisotropy Microscopy; reaction-diffusion systems; Ginzburg-Landau equation; pattern-formation; surface-reaction; controlling turbulence; self-organization; chemical-systems; wave-propagation; target patterns
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.
