"de Gennes" narrowing in supercooled molecular liquids : Evidence for center-of-mass dominated slow dynamics

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dc.creatorAlba-Simionesco, C.
dc.creatorToelle, A.
dc.creatorMorineau, D.
dc.creatorFarago, B.
dc.creatorCoddens, G.
dc.date2001-03-29
dc.date.accessioned2026-07-07T02:40:53Z
dc.date.available2026-07-07T02:40:53Z
dc.descriptionThe density correlation function F(q,t) of the two similar substituted aromatic liquids, Toluene and m-Toluidine, is studied by coherent neutron spin-echo and time-of-flight scattering for wave vectors q around the maximum q_max of the total static structure factor S_m(q) in the supercooled i.e. high density state far away from the normal fluid state. The wave-vector dependence of the mean structural relaxation time tau shows in both liquids a very pronounced de Gennes-like narrowing centered around q_0 < q_max, where q_0 corresponds to the first maximum in the center-of-mass static structure factor S_COM}(q). We find that the narrowing can be described quantitatively by using S_COM(q)/q^2 instead of S_m(q)/q^2 indicating that at the corresponding molecular length scales the relaxation of F(q,t) is dominated by purely translational motion.
dc.description4 pages of LaTeX, 1 page figure captions, 4 figures (extra file)
dc.identifierhttps://arxiv.org/abs/cond-mat/0103599
dc.identifierhttp://arxiv.org/abs/cond-mat/0103599
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/17541
dc.subjectDisordered Systems and Neural Networks
dc.subjectStatistical Mechanics
dc.title"de Gennes" narrowing in supercooled molecular liquids : Evidence for center-of-mass dominated slow dynamics
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