ausblenden:
Schlagwörter:
Ginzburg-Landau equation; Unstable periodic-orbits; Oscillatory CO oxidation; Pattern-formation; Controlling chaos; Feedback-control; Pt(110) surface; Carbon-monoxide, Diode resonator; Subsurface oxygen
Zusammenfassung:
A global time–delay feedback scheme is implemented experimentally to control chemical turbulence in the catalytic CO oxidation on a Pt(110) single crystal surface. The reaction is investigated under ultrahigh vacuum conditions by means of photoemission electron microscopy. We present results showing that turbulence can be efficiently suppressed by applying time-delay autosynchronization. Hysteresis effects are found in the transition regime from turbulence to homogeneous oscillations. At optimal delay time, we find a discontinuity in the oscillation period that can be understood in terms of an analytical investigation of a phase equation with time-delay autosynchronization. The experimental results are reproduced in numerical simulations of a realistic reaction model.
