Abstract:
The refractive index of nematic liquid crystal (NLC) E7 in the $\mathrm{X}$-ray spectral range
using the $\mathrm{X}$-ray interferometric method, was measured experimentally. It was shown that
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 NLC layer, when the molecules are reoriented under the influence of external
electric field.