Abstract
An apparatus for measuring the Doppler effect in the light scattered by solutions of macromolecules is described. The spectral broadening is measured by means of an optical homodyne technique, the theory of which is discussed together with practical considerations involved in its application. A brief statement of the results of the theory of Doppler broadening is made, and some experimental results are presented for Ludox (an aqueous suspension of silica). The variation in the spectral broadening with angle of scatter is shown to agree with theoretical predictions and a particle diameter of 170 Å (17 nm) deduced.
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