Abstract
Abstract A deep knowledge of the process of momentum transfer between distinct particles is of great interest for understanding the microscopic mechanisms of the transport properties in liquids. Time correlation functions between the velocity of a tagged particle and velocities of particles within specified ranges of initial separations have been calculated from molecular dynamics simulations of Lennard-Jones and soft-sphere fluids. These functions allow us to build a picture of the spread of the momentum of a central particle over the successive shells of neighbours. The influence of both the attractive forces in Lennard Jones liquids and the softness of the cores of the interaction potentials on the characteristics of the momentum transfer processes are discussed.
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