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Title: Atomic Dynamics in Simple Liquid: de Gennes Narrowing Revisited

Abstract

The de Gennes narrowing phenomenon is frequently observed by neutron or x-ray scattering measurements of the dynamics of complex systems, such as liquids, proteins, colloids, and polymers. The characteristic slowing down of dynamics in the vicinity of the maximum of the total scattering intensity is commonly attributed to enhanced cooperativity. In this Letter, we present an alternative view on its origin through the examination of the time-dependent pair correlation function, the van Hove correlation function, for a model liquid in two, three, and four dimensions. We find that the relaxation time increases monotonically with distance and the dependence on distance varies with dimension. We propose a heuristic explanation of this dependence based on a simple geometrical model. Furthermore, this finding sheds new light on the interpretation of the de Gennes narrowing phenomenon and the α-relaxation time.

Authors:
 [1];  [2];  [1]
  1. Univ. of Tennessee, Knoxville, TN (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  2. Univ. of Tennessee, Knoxville, TN (United States); Oita Univ. Oita (Japan)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1440836
Alternate Identifier(s):
OSTI ID: 1429955
Grant/Contract Number:
AC05-00OR22725
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 120; Journal Issue: 13; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS

Citation Formats

Wu, Bin, Iwashita, Takuya, and Egami, Takeshi. Atomic Dynamics in Simple Liquid: de Gennes Narrowing Revisited. United States: N. p., 2018. Web. doi:10.1103/PhysRevLett.120.135502.
Wu, Bin, Iwashita, Takuya, & Egami, Takeshi. Atomic Dynamics in Simple Liquid: de Gennes Narrowing Revisited. United States. doi:10.1103/PhysRevLett.120.135502.
Wu, Bin, Iwashita, Takuya, and Egami, Takeshi. Tue . "Atomic Dynamics in Simple Liquid: de Gennes Narrowing Revisited". United States. doi:10.1103/PhysRevLett.120.135502.
@article{osti_1440836,
title = {Atomic Dynamics in Simple Liquid: de Gennes Narrowing Revisited},
author = {Wu, Bin and Iwashita, Takuya and Egami, Takeshi},
abstractNote = {The de Gennes narrowing phenomenon is frequently observed by neutron or x-ray scattering measurements of the dynamics of complex systems, such as liquids, proteins, colloids, and polymers. The characteristic slowing down of dynamics in the vicinity of the maximum of the total scattering intensity is commonly attributed to enhanced cooperativity. In this Letter, we present an alternative view on its origin through the examination of the time-dependent pair correlation function, the van Hove correlation function, for a model liquid in two, three, and four dimensions. We find that the relaxation time increases monotonically with distance and the dependence on distance varies with dimension. We propose a heuristic explanation of this dependence based on a simple geometrical model. Furthermore, this finding sheds new light on the interpretation of the de Gennes narrowing phenomenon and the α-relaxation time.},
doi = {10.1103/PhysRevLett.120.135502},
journal = {Physical Review Letters},
number = 13,
volume = 120,
place = {United States},
year = {Tue Mar 27 00:00:00 EDT 2018},
month = {Tue Mar 27 00:00:00 EDT 2018}
}

Journal Article:
Free Publicly Available Full Text
This content will become publicly available on March 27, 2019
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