论文标题
连贯的硬X射线纳米氨基调bragg衍射中的动力散射
Dynamical Scattering in Coherent Hard X-Ray Nanobeam Bragg Diffraction
论文作者
论文摘要
由动力学衍射引起的独特强度特征是在相干的X射线纳米孔衍射模式中，其厚度大于X射线灭绝深度或纳米级和中尺度特征的组合。我们证明，可以使用光学模型与Darwin的动力学X射线衍射理论相结合来准确预测动态散射效应。该模型包括由菲涅尔区板块产生的高度不同的相干X射线纳米梁，该纳米板聚焦光学元件，并说明了主要的灭绝，多个散射和吸收。模拟准确地重现了从GAAS（001）底物上的GAAS/AlgaAS外延异质结构获得的实验衍射模式的动力散射特征。
Unique intensity features arising from dynamical diffraction arise in coherent x-ray nanobeam diffraction patterns of crystals having thicknesses larger than the x-ray extinction depth or exhibiting combinations of nanoscale and mesoscale features. We demonstrate that dynamical scattering effects can be accurately predicted using an optical model combined with the Darwin theory of dynamical x-ray diffraction. The model includes the highly divergent coherent x-ray nanobeams produced by Fresnel zone plate focusing optics and accounts for primary extinction, multiple scattering, and absorption. The simulation accurately reproduces the dynamical scattering features of experimental diffraction patterns acquired from a GaAs/AlGaAs epitaxial heterostructure on a GaAs (001) substrate.
