Journal Article

PUBDB-2016-05652

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Beamstop-Based Low-Background Ptychography to Image Weakly Scattering Objects

Reinhardt, J. (Corresponding author)DESY* ; Hoppe, R.Extern* ; Hofmann, G.Extern* ; Damsgaard, C. D.Extern* ; Patommel, J.Extern* ; Baumbach, C.Extern* ; Baier, S.Extern* ; Rochet, A.Extern* ; Grunwaldt, J.-D.Extern* ; Falkenberg, G.DESY* ; Schroer, C.DESY*

2017
Elsevier Science Amsterdam

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Please use a persistent id in citations: doi:10.1016/j.ultramic.2016.11.005

Abstract: In recent years, X-ray ptychography has been established as a valuable tool for high-resolution imaging. Nevertheless, the spatial resolution and sensitivity in coherent diffraction imaging are limited by the signal that is detected over noise and over background scattering. Especially, coherent imaging of weakly scattering specimens suffers from incoherent background that is generated by the interaction of the central beam with matter along its propagation path in particular close to and inside of the detector. Common countermeasures entail evacuated flight tubes or detector-side beamstops, which improve the experimental setup in terms of background reduction or better coverage of high dynamic range in the diffraction patterns. Here, we discuss an alternative approach: we combine two ptychographic scans with and without beamstop and reconstruct them simultaneously taking advantage of the complementary information contained in the two scans. We experimentally demonstrate the potential of this scheme for hard X-ray ptychography by imaging a weakly scattering object composed of catalytic nanoparticles and provide the analysis of the signal-to-background ratio in the diffraction patterns.

Note: (c) Elsevier B.V. Post referee full text in progress (embargo 1 year from 14 November 2016). P05K13OD4 and 05K10OD1

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Contributing Institute(s):

1. FS-PETRA (FS-PETRA)
2. Experimentebetreuung PETRA III (FS-PE)
3. DOOR-User (DOOR)

Research Program(s):

1. 6213 - Materials and Processes for Energy and Transport Technologies (POF3-621) (POF3-621)
2. 6G3 - PETRA III (POF3-622) (POF3-622)
3. VH-VI-403 - In-Situ Nano-Imaging of Biological and Chemical Processes (2015_IFV-VH-VI-403) (2015_IFV-VH-VI-403)

Experiment(s):

1. PETRA Beamline P06 (PETRA III)

Appears in the scientific report 2017

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Database coverage:
; BIOSIS Previews ; Current Contents - Life Sciences ; Current Contents - Physical, Chemical and Earth Sciences ; Ebsco Academic Search ; IF < 5 ; JCR ; NCBI Molecular Biology Database ; Nationallizenz ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Thomson Reuters Master Journal List ; Web of Science Core Collection

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