Abstract
The relation between the two memory function formalisms for correlation functions in classical liquids is discussed. It is found that the kinetic equation formalism of Duderstadt and Akcasu with a simple exponential memory function can account for the double Gaussian form of the memory function in the generalized-hydrodynamics approach. The former therefore gives reasonably good results for the coherent scattering function S(k, ω), as is shown for the case of liquid Rb at 315 K in the range 1.25 ⩽k ⩽ 5.5 Å−.
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Nishigori, T. On the memory functions in simple classical liquids. J Stat Phys 20, 83–93 (1979). https://doi.org/10.1007/BF01013747
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DOI: https://doi.org/10.1007/BF01013747