Abstract
Results are presented about the origin of the Kohlrausch-Williams-Watts decay of the incoherent intermediate scattering function (ISF) in molecular dynamics simulated liquid Ni(0.5)Zr(0.5). By the concept of weakly effective particles (WEPs), we establish an interrelationship between ISF and particle dynamics. Temporal correlations in the action of WEPs act structure conserving, reflecting that immobile particles tend to remain immobile. Analysis of the related correlation function yields that these correlations account quantitatively for the stretched exponential like decay.
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