The BZ reaction with oxalic acid substrate is one of the simplest BZ oscillator which oscillates only if the produced bromine is removed by an inert carrier gas. In the present study an electrochemical method is reported to determine kBR, the "rate constant" for bromine removal. Oscillations can be found within a certain interval of the kBR parameter values only. Outside of that range two different excitable states were discovered. Transitions from the oscillatory to the excitable states go via saddle-node infinite period bifurcations. Different types of bifurcations leading to periodic orbits, a two-dimensional phase portrait of an excitable system, and a perturbation technique to reveral that portrait are also discussed.
ASJC Scopus subject areas
- Physical and Theoretical Chemistry