Negative tails in the velocity correlation function of supercooled liquids
- 8 November 2003
- journal article
- research article
- Published by AIP Publishing in The Journal of Chemical Physics
- Vol. 119 (18), 9661-9666
- https://doi.org/10.1063/1.1616514
Abstract
The dynamics of supercooled liquid argon is investigated via a specific correlation function ΔB. Its time behavior is well reproduced by taking into account the separate contributions of an Enskog-type diffusive part and of damped oscillations of vanishing time integral (nondiffusive part). The implications on the velocity correlation function (VCF) are investigated. Phononlike oscillations, also present in the crystal, can explain the first negative lobe and the subsequent shoulder of the VCF. The slow decay of ΔB after the fast dynamics (t<1 ps ) characterizes the liquid state, and produces negative VCF tails at long times (up to about 5 ps).This publication has 30 references indexed in Scilit:
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