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Dynamic susceptibility of supercooled water and its relation to the dynamic crossover phenomenon

Yang Zhang, Marco Lagi, Emiliano Fratini, Piero Baglioni, Eugene Mamontov, and Sow-Hsin Chen
Phys. Rev. E 79, 040201(R) – Published 7 April 2009

Abstract

We study the dynamic susceptibility χT(Q,t) of deeply supercooled water by means of quasielastic neutron scattering and molecular dynamics simulations. Both techniques show an increase in the peak height of χT(Q,t) as the temperature is lowered toward the dynamic crossover temperature TL. Below TL, the peak height decreases steadily. We attribute this phenomenon to the change in slope of the Arrhenius plot of the translational relaxation time at TL. In contrast, the peak height of the calculated four-point correlation function χ4(Q,t), directly related to the size of dynamic heterogeneity, increases toward and below TL.

    • Received 15 January 2009

    DOI:https://doi.org/10.1103/PhysRevE.79.040201

    ©2009 American Physical Society

    Authors & Affiliations

    Yang Zhang1, Marco Lagi1,2, Emiliano Fratini2, Piero Baglioni2, Eugene Mamontov3, and Sow-Hsin Chen1,*

    • 1Department of Nuclear Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
    • 2Department of Chemistry and CSGI, University of Florence, Florence I 50019, Italy
    • 3Spallation Neutron Source, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA

    • *Author to whom correspondence should be addressed. sowhsin@mit.edu

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    Issue

    Vol. 79, Iss. 4 — April 2009

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