Density Dependent Rayleigh Linewidth of Depolarized Doubly Scattered Light

  • J. G. Gallagher
  • Dae M. Kim
  • C. D. Armeniades
Conference paper


There is considerable theoretical and experimental interest in the double scattering mechanism of fluids near their critical point [1,2,3] and of macromolecules in solution [4,5]. Recently, Sorensen et al [4] reported the Rayleigh linewidth measurement of light, doubly scattered from optically isotropic Rayleigh-Gans particles in Brownian motion. Their results show a depolarized correlation spectrum independent of particle number density and scattering angle, and a correlation time, slightly greater than the correlation time for singly scattered light at 180°. Recently, Bertolotti studied the double scattering process with Mie spheres, using two separate cells [6]. In his work he considered the spatial coherence properties of the scattered field and its effects on the second- order correlation function. So far, these investigators have treated the double scattering phenomena by means of the Van Hove space-time density correlation function, applied successively to two statistically independent scattering events. This approach is based on the assumption that the total phase fluctuation of doubly scattered light is caused by both the first and second scatterers in Brownian motion. In addition, this interpretation assumes that the complex degree of coherence can be factorized into spatial and temporal parts.


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Copyright information

© Springer Science+Business Media New York 1978

Authors and Affiliations

  • J. G. Gallagher
    • 1
  • Dae M. Kim
    • 1
  • C. D. Armeniades
    • 1
  1. 1.Rice UniversityHoustonUSA

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