The theoretical expressions of Cooper & Sayer [ J. Appl. Cryst . (1975), 8 , 615] for the peak shift from the true Bragg angle and for the peak broadening in powder neutron-diffraction patterns are confirmed experimentally for detectors with finite aperture. It is shown that these factors ...
By simultaneous consideration of the bicrystal model this fact is interpreted as due to the change in the width of the layer decomposing the wave fields for different angles of incidence. The reflection curves exhibit also the fast modulation unresolved in the convoluted and experimental curves. ...
Due to the diffraction limit, we can only sample F(ω) for |ω| < NA/λ; multiplying the image with a high-frequency patterns cosω0x and sinω0x, and combining them as f(x)cosω0x+jf(x)sinω0x, we get the image f(x)exp(jω0x), whose Fourier transform is F(ω − ω0)...
3.1.2. Patterns from ordered crystals The symmetries of ordered crystal structures are often changed compared to the disordered crystal structure. This results in the appearance of superlattice reflections at positions that are forbidden for the disordered structure. The intensities of the superlattice re...
Diffraction patterns of pGC-A crystals via serial crystallography Harvested needle-shaped crystals grown under the optimized conditions were shipped to the Advanced Photon Source (APS) at Argonne National Laboratory in a temperature-controlled container. Unlike other membrane proteins directly crystallized in...
RECENTLY one of us1 pointed out that the optical diffraction effects by supersonic waves in solids are to be interpreted on the basis of the Raman-Nath2 theory, taking due cognisance of the photo-elastic effects arising from the strains caused by the sound waves. A refined further ...
Secondly, it has been shown that the contrast of strained epitaxial layers is primarily due to structure factor differences which are manifest by: (i) extinction distance shifts and (ii) 未-fringe patterns when the layers are inclined relative to the electron beam. More generally, it has been...
The application of X-ray powder diffraction for the solution and refinement of unknown crystal structures is due to the recent developments in both computa... DM Poojary,A Clearfield - 《Journal of Organometallic Chemistry》 被引量: 42发表: 1996年 X‐ray powder diffraction patterns of calcium ph...
The mode-confinement conditions in the x-ray waveguide (XWG) needed to obtain single-mode beams are determined. The XWGs are stacked to form an XWG array. The core of the XWG array is used as a slit in an opaque screen, similar to those used for visible light. Diffraction patterns ...
diffractionpatternscanbeanalyzedusingeitherFraunhoferorFresnel diffractiontheory.InFraunhofer(far-field)diffractiontheorythesourceis farenoughfromtheaperturethatthewavefrontsareplanaratthe aperture,andtheimageplaneisfarenoughfromtheaperturethatthe wavefrontsareplanarattheimageplane. •Ifthecurvatureoftheopticalwaves...