The time-dependent position self-correlation function of the particles of two-dimensional lattice gases was estimated by Monte Carlo simulations at various concentrations c. Two exponential decay modes were identified for c<0.5 and three modes for c>0.5 in the resulting intermediate incoherent dynamical scattering function. Published microscopic theories for that quantity are found to be at variance with the numerical results at larger wave vectors. A phenomenological description of the results is achieved by two-state models for c<0.5 and three-state models for c>0.5. A detailed physical interpretation of the model parameters, however, is an open question.

Physical Review B 41 (1990), 2784.

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