Abstract
The birth-and-death formalism is applied to chemical reactions in nonideal (in the thermodynamic sense) systems. The combinatorial transition probabilities conventionally used in the ideal theory are replaced by activity-dependent transition probabilities. Exchange of reactants and products with reservoirs is explicitly taken into account. The master equation is expanded in inverse powers of the system volume, and a Fokker-Planck equation is derived in the large system limit. Anomalous fluctuations near instability points are discussed. 16 refs., 1 fig.
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