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Quasielastic light scattering from solutions of lollipop‐shaped particles
Author(s) -
Koopmans G.,
Van Der Meer B. J.,
Hopman P. C.,
Greve J.
Publication year - 1979
Publication title -
biopolymers
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.556
H-Index - 125
eISSN - 1097-0282
pISSN - 0006-3525
DOI - 10.1002/bip.1979.360180615
Subject(s) - rotational diffusion , chemistry , scattering , center (category theory) , light scattering , correlation function (quantum field theory) , anisotropy , diffusion , brownian motion , physics , molecular physics , crystallography , optics , quantum mechanics , dielectric
An expression is derived for the field correlation function of the light scattered from a solution of lollipop‐shaped particles. Such particles are a tractable model of certain bacteriophages. They are assumed to consist of an ellipsoidal head containing optically anisotropic scattering material and a tail which does not scatter. Because of the tail, Brownian rotational movement occurs around a center of rotational friction which is at a distance r 0 from the center of the head. The dependence of the field correlation function C (τ) on the rotational diffusion coefficient D R is given by the factor Σ l B l exp[− l ( l + 1) D R τ]. It is shown that the tail causes the coefficients B l to be different from zero for all values of l . Therefore, C (τ) contains a term proportional to exp(−2 D R τ), which is not present when r 0 = 0. We give plots of B l for various combinations of parameters. It turns out that dynamic light scattering may be used to measure r 0 .