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

Fernandez-Alonso, F, Bermejo, F J, McLain, S E, Turner, J F C, Molaison, J J and Herwig, K W (2007) Observation of fractional Stokes-Einstein behavior in the simplest hydrogen-bonded liquid. Physical Review Letters, 98 (7). 077801/1-077801/4. ISSN 0031-9007

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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 ¿=-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

Item Type: Article
Additional Information: This paper details the first observation of deviation from Stokes-Einstein behaviour in a hydrogen bonded liquid, using quasielastic neutron scattering. International collaboration between JFCT and FJB. JFCT directed the experimental work.
Schools and Departments: School of Life Sciences > Chemistry
Depositing User: John Turner
Date Deposited: 06 Feb 2012 19:12
Last Modified: 01 Jul 2019 13:30
URI: http://sro.sussex.ac.uk/id/eprint/19568

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