Crystal optics as guard apertures for coherent x-ray diffraction imaging |
| |
Authors: | Xiao Xianghui de Jonge Martin D Zhong Yuncheng Chu Yong S Shen Qun |
| |
Institution: | Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, USA. xhxiao@aps.anl.gov |
| |
Abstract: | A crucial issue in coherent x-ray diffraction imaging experiments is how to increase the signal-to-noise ratio when measuring relatively weak diffraction intensities from a nonperiodic object. A novel crystal guard aperture is described that makes use of a pair of multiple-bounce crystal optics to eliminate unwanted parasitic scattering background. This background is often produced by upstream optical elements such as a coherent-beam defining aperture. Recent experimental observation and theoretical analysis confirm the effectiveness of the crystal guard aperture method with coherence-preserved wave propagation through the crystal guard aperture and dramatically reduced scattering background in coherent x-ray diffraction images. |
| |
Keywords: | |
本文献已被 PubMed 等数据库收录! |
|