Observation of fractional Stokes-Einstein behavior in the simplest hydrogen-bonded liquid

F. Fernandez-Alonso; F. J. Bermejo; S. E. McLain; J. F.C. Turner; J. J. Molaison; K. W. Herwig

doi:10.1103/PhysRevLett.98.077801

Observation of fractional Stokes-Einstein behavior in the simplest hydrogen-bonded liquid

F. Fernandez-Alonso, F. J. Bermejo, S. E. McLain, J. F.C. Turner, J. J. Molaison, K. W. Herwig

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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>230K, 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 ξ=-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 [S.R. Becker, Phys. Rev. Lett. 97, 055901 (2006)PRLTAO0031-900710.1103/PhysRevLett.97.055901].

Original language	English
Article number	077801
Journal	Physical Review Letters
Volume	98
Issue number	7
DOIs	https://doi.org/10.1103/PhysRevLett.98.077801
State	Published - Feb 14 2007
Externally published	Yes

Funding

Funders	Funder number
National Science Foundation	0404938, 0349010

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10.1103/PhysRevLett.98.077801

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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>230K, 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 ξ=-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 [S.R. Becker, Phys. Rev. Lett. 97, 055901 (2006)PRLTAO0031-900710.1103/PhysRevLett.97.055901].",

author = "F. Fernandez-Alonso and Bermejo, {F. J.} and McLain, {S. E.} and Turner, {J. F.C.} and Molaison, {J. J.} and Herwig, {K. W.}",

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T1 - Observation of fractional Stokes-Einstein behavior in the simplest hydrogen-bonded liquid

AU - Fernandez-Alonso, F.

AU - Bermejo, F. J.

AU - McLain, S. E.

AU - Turner, J. F.C.

AU - Molaison, J. J.

AU - Herwig, K. W.

PY - 2007/2/14

Y1 - 2007/2/14

N2 - 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>230K, 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 ξ=-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 [S.R. Becker, Phys. Rev. Lett. 97, 055901 (2006)PRLTAO0031-900710.1103/PhysRevLett.97.055901].

AB - 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>230K, 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 ξ=-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 [S.R. Becker, Phys. Rev. Lett. 97, 055901 (2006)PRLTAO0031-900710.1103/PhysRevLett.97.055901].

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Observation of fractional Stokes-Einstein behavior in the simplest hydrogen-bonded liquid

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