Oscillatory reactions quenching

The variation in time of concentrations of species in an oscillatory reaction can be stopped temporarily by application of a pulse perturbation of a species to the system. If the system is close to a supercritical Hopf bifurcation, an interpretation of the addition leading to quenching of oscillations provides information on nonessential species, and on the Jacobian matrix. In quenching experiments, the phase of oscillation at which the perturbation is added and the amount of perturbant added are varied for each perturbing... 

Figure 5.10 Three quenching experiments with equal additions of bromide ion to the BZ reaction at differOTt phases of the oscillatory cycle (a) —97°, (b)...

In the range of reactant concentrations experimentally explored, the reaction is very sluggish if the initial pH of the solution is above 7, whereas when pH < 6, it very rapidly drops to pH 2. When operated in a CSTR, the reaction exhibits steady-state bistability, with pH differences between branches up to ApH 8), and does not lead to kinetic oscillations. However, in an OSFR, it was shown to display a diffusion-driven oscillatory instability because of the long-range activation of the free protons. But this instabihty can be quenched by weakly buffering the system with a low-mobility proton-binding species [58]. This condition is straightforwardly... 

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