Abstract
The absolute determination of the three Frank elastic constants of nematic liquid crystals (MBBA) has been performed by light scattering differential-cross-section measurements. The use of an optimized oblique-incidence geometry allows us to reduce several causes of error, like multiple scattering and spurious scattering due to crystal defects. All the three elastic constants have been obtained on the same specimen homeotropically aligned without changing the alignment of the director, thus reducing boundary distortion effects. It will be shown that the new technique has several advantages with respect to previously used ones. A full description of the experimental arrangement and a discussion of the obtained results is given in the text.
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