Beamstop-based low-background ptychography to image weakly scattering objects

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• 作者：Juliane Reinhardt^a ; ^{juliane.reinhardt@desy.de} ; Robert Hoppe^b ; Georg Hofmann^c ; Christian D. Damsgaard^d ; Jens Patommel^b ; Christoph Baumbach^b ; Sina Baier^c ; Amé ; lie Rochet^c ; Jan-Dierk Grunwaldt^c ; Gerald Falkenberg^a ; Christian G. Schroer^a ; ^e
• 关键词：Ptychography ; Beamstop ; Background scattering ; Signal-to-noise ; High resolution ; Nanoparticles
• 刊名：Ultramicroscopy
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：173
• 期：Complete
• 页码：52-57
• 全文大小：661 K
• 卷排序：173

文摘

An opaque beamstop far-upstream of the detector reduces background scattering. Increased signal-to-background ratio in the diffraction patterns. Simultaneous ptychographic reconstruction of two data sets with and without beamstop. Result shows high spatial resolution of 13 nm of a weakly scattering catalyst sample. High sensitivity to less than 105 atoms.