Molecular dynamics analyzed in terms of continuous measures of dynamic heterogeneity

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Abstract

We analyse the relaxation data of a supercooled liquid in terms of φ(t) = ∫ g(ln τ) φ(t/τ) d ln τ using a Kohlrausch, Williams, and Watts (KWW) type integral kernel φ(t/τ) with exponent, βhom, which serves for varying the degree of homogeneity inherent in the response of each relaxor, while the concomitant g(ln τ) defines the extent of dynamic heterogeneity. The simulated time dependence of solvation free energies as a function of βh0m is compared with experimental solvation dynamics data, ν(t) and σinh(t) derived from time resolved inhomogeneously broadened optical lineshapes. The experimental findings indicate 0.8 ≤ βhom ≤ 1, which states that the dynamical nature of the relaxation process is dominated by the spatial variation of relaxation times, while the possible extent of homogeneous dispersion remains small.

Original languageEnglish (US)
Pages (from-to)41-47
Number of pages7
JournalJournal of Non-Crystalline Solids
Volume235-237
DOIs
StatePublished - Aug 2 1998
Externally publishedYes

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ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Condensed Matter Physics
  • Materials Chemistry

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