在实验中,基于GeorgePorter提出的时间分辨测量原理[77],人们发展了基于同步辐射的时间分辨X射线铁磁共振方法(time-resolved X-ray detected ferromagnetic resonance,TR-XFMR)[78],以及结合铁磁共振和磁二色原理,用同步加速器时钟的微波泵浦激发磁性样品的自旋进动,再用磁二色方法测量信号,通过...
is to present, in the light of a backward look by one physicist who was privileged to work with Sir William Bragg from 1922 until his death in 1942, the overall significance of a half-century of development in the field of X-ray diffraction, as it affected the study of physics .doi...
站在当下,两者都有其意义:劳厄理论触及了倒格子结构,更贴近现代固体物理的精神;布拉格理论则在晶体物理学家中广泛得到应用。 晶体X射线衍射的布拉格公式(Bragg Formulation of X-Ray Diffraction by a Crystal) 在晶体材料中,对于特定波长和入射角的X射线,在实验上观测到极其强烈的散射辐射峰(所谓的布拉格峰),布拉格...
The review of the surface-sensitive X-ray diffraction methods including surface X-ray diffraction and X-ray standing wave method is presented. The discussion is illustrated by numerous examples of applications of these methods in different fields of science and technology. Instrumentation and X-ray ...
“We made use of a pump-probe scheme and combined this X-ray source with a laser-melt-quench technique in which we heat the PCM and transform it into the liquid state using an optical laser pulse (just like on optical re-writeable discs, where PCMs are also employed).” The liquid rap...
衍射(Diffraction)又称为绕射,光线照射到物体边沿后通过散射继续在空间发射的现象。关系:如果采用单色平行光,则衍射后将产生干涉结果。相干波在空间某处相遇后,因位相不同,相互之间产生干涉作用,引起相互加强或减弱的物理现象。 产生明显衍射的条件,(1)是相干波(点光源发出的波),(2)与波长相等或更小的光栅。 衍射...
X-ray computed tomography (CT) is a commercially established modality for imaging large objects like passenger luggage. CT can provide the density and the effective atomic number, which is not always sufficient to identify threats like explosives and nar
Single crystal X-ray diffraction (XRD) is a powerful non-destructive method which allows unambiguously identify crystalline phases, determine a crystal structure (unit cell parameters, a space group, atomic coordinates and atomic occupancies) and, if required, a phase composition. This thesis deals...
2.5.3X-Ray Diffraction X-ray diffractionis an important tool for studying bothamorphousand semi-crystalline polymers [36,37]. It can be used to analyze many features of the microstructure of the material, includinglattice parameters, presence of imperfections,crystallographic orientations(texture), an...