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:
-
- Univ. of Tennessee, Knoxville, TN (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Univ. of Tennessee, Knoxville, TN (United States); Oita Univ. Oita (Japan)
- Publication Date:
- Research Org.:
- Oak Ridge National Laboratory (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:
- 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. https://doi.org/10.1103/PhysRevLett.120.135502
Wu, Bin, Iwashita, Takuya, and Egami, Takeshi. Tue .
"Atomic Dynamics in Simple Liquid: de Gennes Narrowing Revisited". United States. https://doi.org/10.1103/PhysRevLett.120.135502. https://www.osti.gov/servlets/purl/1440836.
@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}
}
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Cited by: 29 works
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Figures / Tables:
Table 1: Parameters determined from power law fitting to $τ$(r). The errors reflect 95% confidence bounds.
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Works referencing / citing this record:
Translational and rotational dynamics of high and low density TIP4P/2005 water
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Figures / Tables found in this record:
Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.