2001/03/29 by C. Alba‐Simionesco, C. Alba-Simionesco, Alba-Simionesco, C. +9
Materials Science · Physics and Astronomy · #Advanced Thermodynamics and Statistical Mechanics #Disordered Systems and Neural Networks (cond-mat.dis-nn) #FOS: Physical sciences #Material Dynamics and Properties #Spectroscopy and Quantum Chemical Studies #Statistical Mechanics (cond-mat.stat-mech) #cond-mat.dis-nn #cond-mat.stat-mech
paper · pdf · doi:10.48550/arxiv.cond-mat/0103599
4 pages of LaTeX, 1 page figure captions, 4 figures (extra file)
arxiv created 2001/03/29 · openalex publication_date 2001/03/29 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
The 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 qmax of the total static structure factor Sm(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 q0 < qmax, where q0 corresponds to the first maximum in the center-of-mass static structure factor SCOM(q). We find that the narrowing can be described quantitatively by using SCOM(q)/q2 instead of Sm(q)/q2 indicating that at the corresponding molecular length scales the relaxation of F(q,t) is dominated by purely translational motion.