Phase response behaviors of different oscillatory states in the Belousov-Zhabotinsky reaction

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We have studied the behavior of phase response curves of different oscillatory states in a Belousov-Zhabotinsky reaction by using the amplified Oregonator model. As perturbants we have used bromide ion and silver ion. In case of oxidation spikes, the effect of bromide ion is a phase delay as reported previously. However, when the oscillations stay a considerable time in the oxidized state, bromide ion can cause significant phase advances, whenever the perturbation exceeds a lower critical bromide ion concentration. We are able to model recent experiments performed by Marek and co-workers, which have been claimed to give poor agreements with Oregonator-type of models. We have also compared the effect of a low (104 M-1 s-1) or high (109 M-1 s-1) silver bromide precipitation rate constant on phase response curves when silver ion perturbs oxidation spikes. We find that best agreements with experiments are obtained when the low silver bromide precipitation rate constant is used. The computations exhibit virtually identical behavior whether the rate constant values due to Field Körös, and Noyes, or to Field and Försterling are used to parametrize the oxybromine chemistry. © 1988 American Institute of Physics.

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The Journal of Chemical Physics