Cell Thickness Effects in the Determination of Elastic Constant Ratios by Observing Rayleigh Light Scattered Intensity

概要

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The effects of the finite scattering volume on the values of elastic constant ratios determined have been studied by computer simulation. The errors in the simulated values of K_1/K_2 and K_3/K_2 are dependent on the position of the starting angle of the scan. The error is greatest for thinner cells (≈7 μm) and in the angular regions where the geometrical factor G_m introduced by de Gennes, or a component of the scattering vector q becomes zero, i.e. for external scattering angles approximately less than 10° and those between approximately 20° and 60°, depending on the scattering geometry used. The approximation introduced by van der Meulen and Zijlstra in defining the orthogonal base system (e_1, e_2, e_3) has also been discussed; it is inappropriate in thin cells to use the scattering vector q instead of the wave vector k_1 of the director fluctuations when determining K_1/K_2.
社団法人応用物理学会の論文
1992-02-15