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Relaxational Dynamics and Strength in Supercooled Liquids from Impulsive Stimulated Thermal Scattering

Published online by Cambridge University Press:  10 February 2011

Yongwu Yang ,
Laura J. Muller  and
Keith A. Nelson
Yongwu Yang
Affiliation:
Department of Chemistry, Massachusetts Institute of Technology, Cambridge, MA 02139
Laura J. Muller
Affiliation:
Department of Chemistry, Massachusetts Institute of Technology, Cambridge, MA 02139 Department of Chemistry and Biochemistry, University of Texas at Austin, Austin, TX 78712
Keith A. Nelson
Affiliation:
Department of Chemistry, Massachusetts Institute of Technology, Cambridge, MA 02139
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Abstract

Impulsive stimulated thermal scattering (ISTS), a time-domain light scattering technique, provides a more than 6-decade time range from sub-ns to many ms. It permits characterization of the structural relaxation dynamics and determination of the relaxation strength or Debye-Waller factor in supercooled liquids, and thus allows testing of the mode coupling theory of the liquidglass transition. ISTS experiments were performed on glass formers salol, butylbenzene, and the molten salt [Ca(N03)]0.4[KNO3]0.6. The relaxational dynamics and the Debye-Waller factorfq=0 were obtained. A square-root anomaly was observed in fq=0 (T) at a crossover temperature Tc for all three materials, consistent with the prediction of mode coupling theory.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 407: Symposium M – Disordered Materials and Interfaces-Fractals, structure and Dynamics , 1995 , 145
Copyright
Copyright © Materials Research Society 1996

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References

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