Pendellosung fringes in distorted crystals

The features of anomalous multiple x-ray transmission in Ge crystals with distortions

“…It should be emphasized that the theoretical research carried out agrees with experimental results [5,6], in which the sharp enhancement of multiple anomalous x-ray transmission has been observed against a background of loosed two-beam scattering areas after the treatment of a crystal surface on diamond pastes and covering it with varnish.…”

“…The dynamical interaction between modes of an x-ray wave field in a crystal in the case of multiple x-ray diffraction results in various effects: the effect of Umweganregung [1]; the effect of Aufhellung [2]; enhancement of anomalous xray transmission [3]; and multiple Pendellösung oscillations [4]. They stipulate the sensitivity of such diffraction to weak strains, which is strengthened by the experimental research of crystals with various structure distortions [5][6][7]. The simulation of x-ray topographical images allows the determination of the type and quantitative values of strains from experimental results as well as knowledge of the character of their distribution over the volume of the crystal.…”

Moir images simulation of strains in x-ray interferometry

“…with the help of geometrical parameters of interference patterns [4][5][6][7][8][9]. Structure defects and macroscopic strains in interferometer plates can change the interference patterns [5,[10][11][12][13][14][15]. The x-ray interferometry is also a powerful tool for the research of medical, biological and palaeontological objects using phase topography [16,17].…”