Abstract
The full Stokes vector of the first-order Raman spectrum has been measured for various scattering geometries, and the results compared with theory. Hence it is shown that the long-wavelength optical vibrations in the zinc-blende structure have the symmetry of the vibrations of a tetrahedral molecule. It is also shown that most of the information contained in the first-order Raman spectrum can be obtained by measuring only a single component of the Stokes vector in a very limited number of scattering geometries.

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