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Dynamic light scattering by non‐ergodic media
Author(s) -
Pusey P. N.
Publication year - 1994
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.19940790104
Subject(s) - ergodic theory , dynamic light scattering , correlation function (quantum field theory) , scattering , speckle pattern , light scattering , reciprocal lattice , reciprocal , intensity (physics) , optics , physics , statistical physics , materials science , mathematics , mathematical analysis , quantum mechanics , linguistics , philosophy , nanoparticle , diffraction , dielectric
The theory of dynamic light scattering (DLS) by non‐ergodic media, systems such as polymeric gels whose density fluctuations are partially “frozen”, is discussed. We derive the relationship between the time‐averaged time correlation function of the scattered intensity, the quantity measured in a single DLS experiment, and the ensemble‐averaged correlation function of the sample's density fluctuations. The connection between DLS, speckle and the reciprocal‐space structure of the medium is also discussed.