The results of direct measurements of the principal indices of refraction in the smectic-A and smectic-C phases of two homologous liquid crystals are reported. These results are compared qualitatively with the orientational model of Straley and with a model based on anisotropic nematic fluctuations due to coupling between orientational and translational order.
Physical Review A
Copyright 1979 American Physical Society. Available on publisher's site at http://dx.doi.org/10.1103/PhysRevA.20.1655.
Lockhart, Thomas E; Allender, David W; Gelerinter, Edward; Johnson, David L (1979). Investigation of the Indexes of Refraction Near the Smectic-A Smectic-C Transition: Orientational Order. Physical Review A 20(4) 1655-1660. Retrieved from https://oaks.kent.edu/phypubs/83