Investigation of the influence of electric field on the anisotropy of nematic liquid crystals by means of $\mathrm{X}$-ray interferometric method

The refractive index of nematic liquid crystal ($\mathrm{NLC})~\mathrm{E7}$ in the $\mathrm{X}$-ray spectral range using the $\mathrm{X}$-ray interferometric method, was measured experimentally. It was shown that $\mathrm{NLC ~~E7}$ is anisotropic medium for $\mathrm{X}$-rays. This method is sensitive to reorientation of the molecules of liquid crystals and allows to measure the refractive index of homogeneously aligned $\mathrm{NLC}$ layer, when the molecules are reoriented under the influence of external electric field.