نتایج جستجو برای: ray diffraction pattern
تعداد نتایج: 665923 فیلتر نتایج به سال:
Electromagnetic wave diffraction by a wide and thick slit has been formulated and analyzed the effect of the slit’s thickness. From our numerical calculation, it has been found that for far field pattern, one can apply a rather simple infinitely thin slit formulation, when the thickness of the wide slit is less than one half wavelength. keywords: Ray-mode coupling, Thick slit diffraction proble...
A new data collection strategy for performing synchrotron energy-dispersive X-ray diffraction computed tomography has been devised. This method is analogous to angle-dispersive X-ray diffraction whose diffraction signal originates from a line formed by intersection of the incident X-ray beam and the sample. Energy resolution is preserved by using a collimator which defines a small sampling voxe...
Serial femtosecond X-ray crystallography (SFX) has created new opportunities in the field of structural analysis of protein nanocrystals. The intensity and timescale characteristics of the X-ray free-electron laser sources used in SFX experiments necessitate the analysis of a large collection of individual crystals of variable shape and quality to ultimately solve a single, average crystal stru...
graphene-based nanocomposites are newly emerged materials with a wide range of applications such as in supercapacitors electrode. the high conductivity and ability for passing electric current, makes graphene an appropriate new item to be used in cells. electroactive transition metal oxides, owing fast reversible redox pairs, are used to store electrical charge. furthermore, the graphene/nio na...
Precession electron diffraction (PED) is a hollow cone non-stationary illumination technique for electron diffraction pattern collection under quasikinematical conditions (as in X-ray Diffraction), which enables “ab-initio” solving of crystalline structures of nanocrystals. The PED technique is recently used in TEM instruments of voltages 100 to 300 kV to turn them into true electron diffractom...
X-ray free-electron lasers (XFELs) deliver x-ray pulses with a coherent flux that is approximately eight orders of magnitude greater than that available from a modern third-generation synchrotron source. The power density of an XFEL pulse may be so high that it can modify the electronic properties of a sample on a femtosecond time scale. Exploration of the interaction of intense coherent x-ray ...
CPD chairman’s message, Paolo Scardi 2 CPD projects: 2 Quantitative Phase Analysis RR, Ian Madsen Editor’s message, Robert Dinnebier 2 Thirty five years ago, Hugo Rietveld 3 WWW sites related to Powder Diffraction 5 IUCr Commission on Powder Diffraction 5 Rietveld Refinement from Powder Diffraction Data Beyond the abilities of Rietveld analysis: MEM-based pattern fitting with synchrotron X-ray ...
When a very intense beam is used for illuminating an object in coherent x-ray diffraction imaging, the intensities at the center of the diffraction pattern for the object are cut off by a beam stop that is utilized to block the intense beam. Until now, only iterative phase-retrieval methods have been applied to object reconstruction from a single diffraction pattern with a deficiency of central...
Two recent advances in quantitative convergent beam electron diffraction (CBED) developed at the University of Bristol are described in this paper. The first is a new scanning technique in which the diffracted intensities in the resulting pattern are integrated through the Bragg condition, equivalent to precessing the sample around a stationary beam. Many more reflections are excited than in a ...
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