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Fernandez-Alonso, F; Bermejo, F J; McLain, S E; Turner, J F C; Molaison, J J; Herwig, K W (2007)
Languages: English
Types: Article
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
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    • 1ISIS Facility, Rutherford Appleton Laboratory, Chilton, Didcot, Oxfordshire OX11 0QX, United Kingdom
    • 2CSIC-Instituto Estructura de la Materia & Department of Electricity and Electronics, University Basque Country,
    • P.O. Box 644, Bilbao 48080, Spain
    • 3Department of Chemistry, The University of Tennessee, Knoxville, Tennessee 37996-1600, USA
    • 4Spallation Neutron Source, Oak Ridge National Laboratory, Scarboro Road, Oak Ridge, Tennessee 37830, USA
    • (Received 24 October 2006; published 14 February 2007)
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