The effects of molecular fluctuations on chemical oscillations and chaos are investigated. The calculations are carried out using a reactive latticehyphen;gas automaton which provides a mesoscopic description of the reactive dynamics. A specific chemical model, the Willamowskindash;Rouml;ssler reaction, is used to illustrate the effects. The applicability of masshyphen;action rate laws and reactionhyphen;diffusion equations are considered and the character of the fluctuations in various dynamical regimes for both spatiallyhyphen;distributed and spatiallyhyphen;homogeneous systems are examined. The work provides information on the molecular origin of macroscopic, selfhyphen;organized structures in farhyphen;fromhyphen;equilibrium reacting systems.
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