Dynamic heterogeneity by higher moments of a relaxing quantity

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations

Abstract

A relaxation experiment usually acquires a measure for the mean energetic distance of the system from the thermodynamic equilibrium and its temporal evolution. For sufficiently small perturbations necessary to assure linear responses such data is bound to remain undecisive as regards the spatial nature of the relaxation process, heterogeneous or homogeneous. The technique of solvation dynamics near the glass transition can probe the entire distribution of site specific energies and its approach towards equilibrium, so that apart from the mean solvation energy v(t) also higher moments in terms of the inhomogeneous optical linewidth σ inh(t) become accessible. While v(t) maps the dielectric relaxation behaviour of the liquid, σ inh(t) is found to be sensitive to the spatial nature of the underlying process. Contrasting experiment and simulation leads to the conclusion, that the relaxation time is a site specific quantity, i.e. the heterogeneous nature is found to dominate.

Original languageEnglish (US)
Title of host publicationMaterials Research Society Symposium - Proceedings
EditorsW.J. Gray, I.R. Triay
PublisherMaterials Research Society
Pages127-132
Number of pages6
Volume455
StatePublished - 1997
Externally publishedYes
EventProceedings of the 1996 MRS Fall Meeting - Boston, MA, USA
Duration: Dec 2 1996Dec 6 1996

Other

OtherProceedings of the 1996 MRS Fall Meeting
CityBoston, MA, USA
Period12/2/9612/6/96

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials

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    Richert, R. (1997). Dynamic heterogeneity by higher moments of a relaxing quantity. In W. J. Gray, & I. R. Triay (Eds.), Materials Research Society Symposium - Proceedings (Vol. 455, pp. 127-132). Materials Research Society.