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3.2 Dynamic light scattering

Figure 3.1: Typical scattering geometry.

with the circular frequency ω0 and the normal vector ⃗ni. The field of the electromag- netic wave induces an oscillating electronic polarization. Hence, the molecules behave as Hertzian dipoles and provide a secondary light source. From the Maxwell-equations follows the light wave propagation in a detector direction⃗k f :

with the electric field constant ε0, and with ⃗R being the position of the detector. The Eq.(3.4) describes the electric field propagating from an elementary dipole originating from a molecule. The electrical field from all molecules in the scattering volume follows as:

with the constant C = (παE0/ε0λ2)· 1

R and ˆ⃗R = ⃗R

|⃗R|. In principle, relation (3.5) describes the scattered light completely. In practice, however, the light intensity is obtained from

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