Spectrum of Light Scattered by Critical Fluctuations

  • George B. Benedek
Conference paper

Abstract

Near the critical point of second order phase transitions the order parameter describing the system shows very large amplitude fluctuations which relax back to equilibrium ever more slowly as the critical point is approached. This paper will present a brief review of experimental studies of the intensity and spectrum of light scattered near critical points of simple fluids and two component critical mixtures. These provide detailed information on the divergence of the fluctuations and their relaxation times in fluids. As has been pointed out by Ginzburg analogous behavior is to be observed in solids near second order phase transitions. We also propose a measurement of the spectral width of quasielastically scattered light as an indicator of the existence of critical opalescence in a solid. Estimates of the line width for such scattering are given for the case of NH4Cl.

Keywords

Order Phase Transition Sulphur Hexafluoride Pure Fluid Coexistence Curve Beat Note 
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Copyright information

© Springer Science+Business Media New York 1969

Authors and Affiliations

  • George B. Benedek
    • 1
  1. 1.Department of Physics and Center for Materials Sciences and EngineeringMassachusetts Institute of TechnologyCambridgeUSA

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