Stochastic resonance in chemistry .3. The minimal-bromate reaction

In the present work we report the measurement of stochastic resonance in the minimal-bromate (MB) reaction. The chemical reaction is placed in an excitable focal steady state in a CSTR. When a weak periodic signal together with noise is superimposed on the focus, the Hopf bifurcation is crossed and the system responds with irregular spikes. The periodic signal alone is not sufficient to cross the threshold. An optimal noise level exists at which the periodic signal is optimally detected via the spiking behavior of the reaction. This is done through the signal-to-noise ratio or the interspike histogram that pass through a maximum at stochastic resonance. For numerical simulations we use the Noyes-Field-Thomson (NFT) model which is known to agree with the kinetics of the MB reaction.