000632814 001__ 632814 000632814 005__ 20250725213732.0 000632814 0247_ $$2doi$$a10.1107/S2053273323092483 000632814 0247_ $$2ISSN$$a0108-7673 000632814 0247_ $$2ISSN$$a0567-7394 000632814 0247_ $$2ISSN$$a1600-5724 000632814 0247_ $$2ISSN$$a1600-8596 000632814 0247_ $$2ISSN$$a2053-2733 000632814 037__ $$aPUBDB-2025-02238 000632814 041__ $$aEnglish 000632814 082__ $$a530 000632814 1001_ $$0P:(DE-H253)PIP1006324$$aChapman, Henry N.$$b0$$eCorresponding author$$udesy 000632814 1112_ $$aTwenty-Sixth Congress and General Assembly of the International Union of Crystallography$$cMelbourne$$d2023-08-22 - 2023-08-29$$gIUCr 2023$$wAustralia 000632814 245__ $$aCoherent X-ray diffraction with a convergent beam 000632814 260__ $$c2023 000632814 3367_ $$0PUB:(DE-HGF)1$$2PUB:(DE-HGF)$$aAbstract$$babstract$$mabstract$$s1753429559_2691239 000632814 3367_ $$033$$2EndNote$$aConference Paper 000632814 3367_ $$2BibTeX$$aINPROCEEDINGS 000632814 3367_ $$2DRIVER$$aconferenceObject 000632814 3367_ $$2DataCite$$aOutput Types/Conference Abstract 000632814 3367_ $$2ORCID$$aOTHER 000632814 520__ $$aWith the development of improved multilayer Laue lenses (MLLs) [1] and sensitive wavefront diagnostics [2,3], it is now possible to focus X-ray beams at synchrotron radiation facilities and X-ray free-electron lasers to spot sizes of 5 nm or less. These are diffractive optics made by layer deposition, in which the layer period varies inversely with distance from the optical axis and the layers are wedged [4] to ensure that the tilt of the layers satisfies the Bragg condition. In this way, an MLL is the physical embodiment of the Ewald sphere. The convergence angle of these lenses can exceed 0.03 rad for a wavelength of 0.7 nm (17 keV) This convergence is often greater than the angular separation of Bragg peaks in a macromolecular crystal, which is equivalent to saying that the focal spot is smaller than the unit cell of the crystal. This creates several interesting opportunities for the study of the structure of macromolecular crystals. When the crystal is placed in the focus, Bragg peaks may overlap and interfere [6], but extremely short exposure times are required to avoid radiation damage, requiring snapshot diffraction using XFEL pulses. Indexing and classification algorithms could then be used to generate a ptychographic dataset [7] that is a function of crystal orientation and the location of the focus relative to the unit cell. Damage can also be avoided by placing the crystal in the beam diverging from the focus, allowing topographic imaging of the crystals and Bragg lines that give fully-integrated reflections. This approach also has benefits for crystals with unit cell dimensions that are smaller than the focus size. It enables a simplified approach for multi-Bragg ptychography and the characterisation of strain and defects at high resolution. Experimental results and analysis of convergent-beam diffraction from protein and inorganic crystals will be presented. 000632814 536__ $$0G:(DE-HGF)POF4-633$$a633 - Life Sciences – Building Blocks of Life: Structure and Function (POF4-633)$$cPOF4-633$$fPOF IV$$x0 000632814 536__ $$0G:(GEPRIS)390715994$$aAIM, DFG project G:(GEPRIS)390715994 - EXC 2056: CUI: Advanced Imaging of Matter (390715994)$$c390715994$$x1 000632814 536__ $$0G:(DE-H253)I-20231166$$aFS-Proposal: I-20231166 (I-20231166)$$cI-20231166$$x2 000632814 588__ $$aDataset connected to CrossRef, Journals: bib-pubdb1.desy.de 000632814 693__ $$0EXP:(DE-H253)P-P11-20150101$$1EXP:(DE-H253)PETRAIII-20150101$$6EXP:(DE-H253)P-P11-20150101$$aPETRA III$$fPETRA Beamline P11$$x0 000632814 7001_ $$0P:(DE-H253)PIP1006443$$aBajt, S.$$b1 000632814 7001_ $$0P:(DE-H253)PIP1089491$$aLi, Chufeng$$b2 000632814 7001_ $$0P:(DE-H253)PIP1086928$$aIvanov, Nikolay$$b3 000632814 7001_ $$0P:(DE-H253)PIP1088012$$aDresselhaus, J. L.$$b4 000632814 7001_ $$0P:(DE-H253)PIP1097799$$aZhang, Wenhui$$b5 000632814 7001_ $$0P:(DE-H253)PIP1100352$$aZakharova, M.$$b6 000632814 7001_ $$0P:(DE-H253)PIP1006155$$aYefanov, O.$$b7 000632814 7001_ $$0P:(DE-H253)PIP1099331$$aPateras, A.$$b8 000632814 7001_ $$0P:(DE-H253)PIP1011659$$aFleckenstein, Holger$$b9 000632814 7001_ $$0P:(DE-H253)PIP1016171$$aPrasciolu, M.$$b10 000632814 773__ $$0PERI:(DE-600)2020844-3$$a10.1107/S2053273323092483$$gVol. 79, no. a2, p. 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