Abstract
We study tagged particle dynamics in a one-component simple liquidcharacterized by the Lennard-Jones (LJ) interaction potential. Extended modecoupling theory is used to obtain the correlation function which feeds back on thedynamics of the self-correlations. The cooperative dynamical effects are studied byevaluating various properties of tagged particle motion as influenced by thecollective dynamics. Comparison between the results obtained for particles withpurely repulsive interactions like the truncated LJ potential (or the hard-sphereinteraction) and that of the full LJ potential are shown. The nature of the velocityautocorrelation function and the non-Gaussian variation of the van Hoveself-correlation function is specifically highlighted here. The role of staticstructural input in the theory is considered especially in this regard.
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