Effects of molecular fluctuations on chemical oscillations and chaos

The effects of molecular fluctuations on chemical oscillations and chaos are investigated. The calculations are carried out using a reactive lattice‐gas automaton which provides a mesoscopic description of the reactive dynamics. A specific chemical model, the Willamowski–Rossler reaction, is used to illustrate the effects. The applicability of mass‐action rate laws and reaction‐diffusion equations are considered and the character of the fluctuations in various dynamical regimes for both spatially‐distributed and spatially‐homogeneous systems are examined. The work provides information on the molecular origin of macroscopic, self‐organized structures in far‐from‐equilibrium reacting systems.