Front explosion in a periodically forced surface reaction

Abstract

Resonantly-forced oscillatory reaction-diffusion systems can exhibit fronts with complicated interfacial structure separating phase-locked homogeneous states. For values of the forcing amplitude below a critical value the front "explodes" and the width of the interfacial zone grows without bound. Such front explosion phenomena are investigated for a realistic model of catalytic CO oxidation on a Pt(110) surface in the 2:1 and 3:1 resonantly-forced regimes. In the 2:1 regime, the fronts are stationary and the front explosion leads to a defect-mediated turbulent state. In the 3:1 resonantly-forced system, the fronts propagate. The front velocity tends to zero as the front explosion point is reached and the final asymptotic state is a 2:1 resonantly-locked labyrinthine pattern. The front dynamics described here should be observable in experiment since the model has been shown to capture essential features of the CO oxidation reaction.

7 pages, 11 figures

References in corpus (2)

• Four-phase patterns in forced oscillatory systems
• Defect turbulence in inclined layer convection

Cited by in corpus (4)

• Self-organized alternating chimera states in oscillatory media
• Effects of external global noise on the catalytic CO oxidation on Pt(110)
• Exponential system-size dependence of the lifetime of transient spiral chaos in excitable and oscillatory media
• Pattern formation in reaction-diffusion systems in the presence of short-term memory