Density Dependent Rayleigh Linewidth of Depolarized Doubly Scattered Light
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  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 . 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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- 2.L.A. Reith and H.L. Swinney, Phys. Rev. Al2, 1094 (1975).Google Scholar
- 3.A.J. Bray and R.F. Chang, Phys. Rev. Al2, 2594 (1975).Google Scholar
- 5.R.C. Colby, L.M. Narducci, V. Bluemel, and J. Baer, Phys. Rev. Al2, 1530 (1975).Google Scholar
- 6.M. Bertolotti, Photon Correlation and Velocimetry (NATO Adv. Study Inst. Series) ed. by H. Cummins and R. Pike, ( Plenum, New York, 1977 ).Google Scholar
- 7.J.G. Gallagher, Dae M. Kim and C.D. Armeniades, Colloid and Interface Science, vol. V, ed. by M. Kerker, ( Academic, New York, 1976 ).Google Scholar
- 8.A.P. Ivanov, A. Ya Khairullina, and A.P. Chaikovokii, Opt. Spectroc. 35, 668 (1973).Google Scholar
- 9.P.N. Pusey, Photon Correlation and Light Beating Spectroscopy, (NATO Adv. Study Inst. Series) ed. by H. Cummins and R. Pike ( Plenum, New York, 1974 ).Google Scholar
- 10.M. Born and E. Wolf, Principles of Optics, 4th edition ( Pergamon, New York, 1974 ).Google Scholar
- 11.S.G. Lipson and H. Lipson, Optical Physics (Cambridge University Press, 1969) (See Chap. 8).Google Scholar