TRAVELING PULSES IN ANISOTROPIC OSCILLATORY MEDIA WITH GLOBAL COUPLING

The CO oxidation on the (110) surface of a platinum single crystal has a strongly state dependent diffusion anisotropy. The surface is coupl ed globally through the gas phase. We consider the oscillatory regime. The dependence of the anisotropy on the surface structure is modeled by a cubic equation. We have found, that diffusion driven traveling pu lses in the oscillatory regime-so-called phase flips-can arise from a small phase gradient under global coupling. Anisotropy causes five dif ferent regimes of the expansion of phase flips and spiral formation. T he spiral formation additionally depends on the direction of the rotat ion of the spiral.