نتایج جستجو برای: ray coherent scattering
تعداد نتایج: 455442 فیلتر نتایج به سال:
Investigating the relationship between structure and dynamical processes is a central goal in condensed matter physics. Perhaps most noted two phenomenon of de Gennes narrowing, which relaxation times liquids are proportional to scattering factor. Here, similar discovered during self-organized ion-beam nanopatterning silicon using coherent x-ray scattering. However, contrast exponential fluctua...
The scattering characteristic of paraxial gaussian beam from two dimensional dielectric rough surfaces is studied in this paper. The modification of the Kirchhoff approximation theory for rough surface scattering by an incident gaussian beam instead of a plane wave are developed based on conventional Kirchhoff scattering theory and plane wave spectrum expansion method. The coherent and incohere...
Ultrafast light pulses can modify electronic properties of quantum materials by perturbing the underlying, intertwined degrees of freedom. In particular, iron-based superconductors exhibit a strong coupling among electronic nematic fluctuations, spins and the lattice, serving as a playground for ultrafast manipulation. Here we use time-resolved X-ray scattering to measure the lattice dynamics o...
Methods for carrying out coherent X-ray scattering experiments are reviewed. The brilliance of the available synchrotron sources, the characteristics of the existing optics, the various ways of obtaining a beam of controlled coherence properties and the detectors used are summarized. Applications in the study of the dynamics of speckle patterns are described. In the case of soft condensed matte...
Angularly resolved X-ray scattering measurements from fs-laser heated hydrogen have been used to determine the equilibration of electron and ion temperatures in warm dense matter regime. The relaxation rapidly cryogenic is visualized using 5.5 keV pulses Linac Coherent Light (LCLS) source a 1 Hz repetition rate pump-probe setting. We demonstrate that electron-ion energy transfer faster than qua...
In a coherent X-ray small-angle experiment, heterodyning between the scattering amplitudes of two samples is obtained by stacking a static reference and a fluctuating sample. Results of homodyne and heterodyne measurements are compared in the case of 98 nm diameter latex particles in glycerol. The method is also used for the study of the slow relaxation process of carbon-blackfilled ethylene–pr...
We report the direct observation of slow fluctuations of helical antiferromagnetic domains in an ultrathin holmium film using coherent resonant magnetic x-ray scattering. We observe a gradual increase of the fluctuations in the speckle pattern with increasing temperature, while at the same time a static contribution to the speckle pattern remains. This finding indicates that domain-wall fluctua...
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