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Non-Critical Rayleigh Scattering from Pure Liquids

  • C. J. Oliver
  • E. R. Pike
  • J. M. Vaughan

Abstract

The spectrum of light scattered by a non-critical pure liquid contains both Brillouin components, shifted from the centre frequency, and a non-shifted Rayleigh component. Acoustic phonon scattering gives rise to the Brillouin lines which are typically shifted by a few GHz from the laser line. Isobaric entropy fluctuations give rise to the non-shifted Rayleigh component whose width depends on the thermal diffusivity of the liquid. The half-width at half-height of the Rayleigh line is given by
$$\Gamma \left( {{\rm{radiance/sec}}} \right) = \frac{\Lambda }{{{\rm{C}}_{\rm{p}}^{\rm{*}}}}{\left( {{\rm{2n}}\,{{\rm{k}}_{\rm{o}}}\,{\rm{Sin}}\frac{{\rm{\theta }}}{{\rm{2}}}} \right)^2},$$
(1)
where ko is the magnitude of the incident wave vector,θ the scatter­ing angle, n the refractive index, C p * the specific heat per unit volume and Λ the thermal conductivity. The thermal diffusivity de­pends on the specific heat and the thermal conductivity and is given by Λ/C p * .

Keywords

Thermal Diffusivity Count Rate Pure Liquid Coherence Time Instrument Function 
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

© Plenum Press, New York 1973

Authors and Affiliations

  • C. J. Oliver
    • 1
  • E. R. Pike
    • 1
  • J. M. Vaughan
    • 1
  1. 1.Royal Radar EstablishmentMalvern, WorcsUK

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