Abstract
Particle motion in colloidal suspensions causes Doppler shifts in scattered laser light. For pure diffusion, the resulting spectral broadening may be measured by intensity interferometry and photon correlation techniques. Measured line widths or decay times yield particle size information. Electrophoretic mobilities may be determined, if an electric field is applied to the suspension. However, resulting line shifts can be extremely small and real-time optical phase processing may be required to resolve it. Finally, information about particle interactions may be obtained by studying angular cross sections or by photon correlation measurements on a small number of particles, i.e. using a very small scattering volume.
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