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


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.


Neural Network Diffusion Coefficient Glass Transition Static Field Nonlinear Dynamics 
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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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