skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Observation of Fractional Stokes-Einstein Behavior in the Simplest Hydrogen-bonded Liquid

Abstract

Quasielastic neutron scattering has been used to investigate the single-particle dynamics of hydrogen fluoride across its entire liquid range at ambient pressure. For T > 230 K, translational diffusion obeys the celebrated Stokes-Einstein relation, in agreement with nuclear magnetic resonance studies. At lower temperatures, we find significant deviations from the above behavior in the form of a power law with exponent xi = -0.71+/-0.05. More striking than the above is a complete breakdown of the Debye-Stokes-Einstein relation for rotational diffusion. Our findings provide the first experimental verification of fractional Stokes-Einstein behavior in a hydrogen-bonded liquid, in agreement with recent computer simulations.

Authors:
 [1];  [1];  [2];  [3];  [4];  [2]
  1. ORNL
  2. ISIS Facility, Rutherford Appleton Laboratory
  3. CSIC - Inst. Estructura de la Materia & Dept. of Electricity and Electronics
  4. University of Tennessee, Knoxville (UTK)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Spallation Neutron Source (SNS)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
978744
DOE Contract Number:  
DE-AC05-00OR22725
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review Letters; Journal Volume: 98; Journal Issue: 7
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; BREAKDOWN; COMPUTERIZED SIMULATION; DIFFUSION; HYDROFLUORIC ACID; NEUTRONS; NUCLEAR MAGNETIC RESONANCE; SCATTERING; VERIFICATION

Citation Formats

Herwig, Kenneth W, Molaison, Jamie J, Fernandez-Alonso, F., Bermejo, F. J., Turner, John F. C., and McLain, Sylvia E.. Observation of Fractional Stokes-Einstein Behavior in the Simplest Hydrogen-bonded Liquid. United States: N. p., 2007. Web.
Herwig, Kenneth W, Molaison, Jamie J, Fernandez-Alonso, F., Bermejo, F. J., Turner, John F. C., & McLain, Sylvia E.. Observation of Fractional Stokes-Einstein Behavior in the Simplest Hydrogen-bonded Liquid. United States.
Herwig, Kenneth W, Molaison, Jamie J, Fernandez-Alonso, F., Bermejo, F. J., Turner, John F. C., and McLain, Sylvia E.. Mon . "Observation of Fractional Stokes-Einstein Behavior in the Simplest Hydrogen-bonded Liquid". United States. doi:.
@article{osti_978744,
title = {Observation of Fractional Stokes-Einstein Behavior in the Simplest Hydrogen-bonded Liquid},
author = {Herwig, Kenneth W and Molaison, Jamie J and Fernandez-Alonso, F. and Bermejo, F. J. and Turner, John F. C. and McLain, Sylvia E.},
abstractNote = {Quasielastic neutron scattering has been used to investigate the single-particle dynamics of hydrogen fluoride across its entire liquid range at ambient pressure. For T > 230 K, translational diffusion obeys the celebrated Stokes-Einstein relation, in agreement with nuclear magnetic resonance studies. At lower temperatures, we find significant deviations from the above behavior in the form of a power law with exponent xi = -0.71+/-0.05. More striking than the above is a complete breakdown of the Debye-Stokes-Einstein relation for rotational diffusion. Our findings provide the first experimental verification of fractional Stokes-Einstein behavior in a hydrogen-bonded liquid, in agreement with recent computer simulations.},
doi = {},
journal = {Physical Review Letters},
number = 7,
volume = 98,
place = {United States},
year = {Mon Jan 01 00:00:00 EST 2007},
month = {Mon Jan 01 00:00:00 EST 2007}
}