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Zeitschrift für Physik B Condensed Matter

, Volume 88, Issue 2, pp 195–204 | Cite as

Translational and rotational diffusion in supercooled orthoterphenyl close to the glass transition

  • F. Fujara
  • B. Geil
  • H. Sillescu
  • G. Fleischer
Original Contributions

Abstract

Self diffusion coefficients in supercooled orthoterphenyl (OTP) have been determined down toD t =3·10−14 m2s−1 using a1H-NMR technique applying static field gradients up to 53T m−1 In a range of more than two decades theD t values agree with those of photochromic tracer molecules of the same size determined by forced Rayleigh scattering down to the glass transition temperatureT g . A change of mechanism is found for translational diffusion atT c ≈1.2T g whereD t is proportional to the inverse shear viscosityη−1 atT>T c butD t ηξ with ξ=0.75 atT<T c . Rotational correlation times determined by2H-NMR stimulated echo techniques in deuterated OTP remain proportinal toη−1 down toT g . Our results are discussed in relation with mode coupling theory and with models of cooperative motion at the glass transition.

Keywords

Neural Network Diffusion Coefficient Glass Transition Static Field Nonlinear Dynamics 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag 1992

Authors and Affiliations

  • F. Fujara
    • 1
  • B. Geil
    • 1
  • H. Sillescu
    • 1
  • G. Fleischer
    • 2
  1. 1.Institut für Physikalische ChemieUniversität MainzMainzFederal Republic of Germany
  2. 2.Sektion PhysikUniversität LeipzigLeipzigFederal Republic of Germany

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