Dispersive spread of virtual sources by asymmetric X-ray monochromators

Huang, Xianrong; Macrander, Albert T.; Hönnicke, Marcelo Gonçalves; Cai, Yong Q.; Fernández, P.

doi:10.1107/s0021889812003366

Cited by 23 publications

(24 citation statements)

References 37 publications

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“…Also the slowly varying phase structure across the reconstructions is a good indication that the incident illumination at the KB focus was relatively uniform. This is consistent with the earlier findings of Huang et al (2012) who used scanning diffraction measurements of a ZnO crystal to recover the focused illumination profile at the same beamline under similar experimental conditions. It is worth noting that the small phase gradient observed here (particularly at the edges of the crystals) may be an artefact of beam curvature.…”

Section: Relative Fwhm and Rsm Volume Changesupporting

confidence: 91%

“…It may be that, if the beam profile has a strong gradient or if there are hotspots within the profile, this may be the explanation for at least some of the observations during this experiment. From previously published experiments by Huang et al (2012), it is known that at the KB focus the beam profile resembles a Gaussian. In the present case the sample is comparable with or smaller than the beam FWHM.…”

Section: Discussion Summarymentioning

confidence: 99%

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Bragg coherent diffraction imaging and metrics for radiation damage in protein micro-crystallography

Coughlan

Darmanin

Kirkwood

et al. 2017

J Synchrotron Radiat

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The proliferation of extremely intense synchrotron sources has enabled ever higher-resolution structures to be obtained using data collected from smaller and often more imperfect biological crystals (Helliwell, 1984). Synchrotron beamlines now exist that are capable of measuring data from single crystals that are just a few micrometres in size. This provides renewed motivation to study and understand the radiation damage behaviour of small protein crystals. Reciprocal-space mapping and Bragg coherent diffractive imaging experiments have been performed on cryo-cooled microcrystals of hen egg-white lysozyme as they undergo radiation damage. Several well established metrics, such as intensity-loss and lattice expansion, are applied to the diffraction data and the results are compared with several new metrics that can be extracted from the coherent imaging experiments. Individually some of these metrics are inconclusive. However, combining metrics, the results suggest that radiation damage behaviour in protein micro-crystals differs from that of larger protein crystals and may allow them to continue to diffract for longer. A possible mechanism to account for these observations is proposed.

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Section: Relative Fwhm and Rsm Volume Changesupporting

confidence: 91%

Section: Discussion Summarymentioning

confidence: 99%

Bragg coherent diffraction imaging and metrics for radiation damage in protein micro-crystallography

Coughlan

Darmanin

Kirkwood

et al. 2017

J Synchrotron Radiat

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“…To overcome some limitations of CDI, an efficient ptychography method (by scanning an extended sample through a confined illumination and recording diffraction patterns at overlapped scanning positions) has been published recently. Huang et al (2012) present a combined Bragg CDI with ptychography technique that allowed them to reconstruct the three-dimensional electron density and strain field of an extended ZnO microcrystal.…”

mentioning

confidence: 99%

X-ray diffraction microscopy: emerging imaging techniques for nondestructive analysis of crystalline materials from the millimetre down to the nanometre scale

Borbély

Kaysser-Pyzalla

2013

J Appl Cryst

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The discovery made in 1912 by Laue, Friedrich and Knipping, as well as the subsequent work by the Braggs, father and son, laid down the basis for one of the most successful experimental methods in the history of science: X-ray diffraction (XRD). The method has been essential to the scientific discoveries of more than 30 Nobel laureates, illustrating its utility and wide dissemination in many scientific disciplines, encompassing physics, chemistry, biology and medicine. In addition, XRD has underpinned many advances in applied sciences, for example, materials science in the fields of alloy development and component testing, as well as engineering sciences, thereby facilitating the contributions of both basic and applied sciences to the welfare of today's society. This has been highlighted by the recent decision of the United Nations to declare 2014 the International Year of Crystallography. Celebrating this achievement, a number of events and publications will review the major work carried out over the past 100 years; during this period XRD has evolved to become a powerful and indispensable tool in all those scientific fields where knowledge of the relations between crystal structure, function and properties plays an essential role. Today new sources and new techniques open new horizons in XRD techniques and science using XRD.As part of the preparations for the International Year of Crystallography, Journal of Applied Crystallography has published a series of articles on novel diffraction methods enabling visualization of the internal structure of crystalline materials from the millimetre down to the nanometre scale. These works, now gathered together into a virtual issue on X-ray diffraction microscopy, summarize recent developments in the nondestructive monitoring of structural and dynamic information from the bulk of materials in three dimensions. It is believed that this coupled information could lead to a deeper understanding of some of the major problems in materials and engineering sciences, such as polycrystal plasticity or damage. The selected articles describe briefly the methods, focusing mainly on applications. Advantages, limits and future prospects of the techniques are also highlighted.A synthesis of the methods developed around the concept of three-dimensional X-ray diffraction is presented in the article by Poulsen (2012): An introduction to threedimensional X-ray diffraction microscopy. A common feature of these methods is the three-dimensional spatial character of the recovered information, usually attained through a tomographic approach. The main aim of the techniques is the complete spatial, dynamic and time-resolved characterization of a material. Resolution requirements, however, impose constraints on the diffraction setup or acquisition time, demanding that the experimentalist find a good compromise between the obtainable spatial, angular and time resolutions and those characteristic for the investigated phenomenon. Selection of a specific method is usually determined by the nature of the ...

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“…From the theory described therein it follows that the impinging polychromatic and parallel beam is sagittally deviated and sagittally spread after diffraction. The spread is responsible for the coherence destruction as shown by Brauer et al (1995), Huang et al (2012) and Souvorov et al (1999).…”

Section: Asymmetric Crystal Monochromatormentioning

confidence: 99%

Possibility of X-ray pulse compression using an asymmetric or inclined double-crystal monochromator

Hrdý

Oberta

2013

J Synchrotron Radiat

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It is shown theoretically that the asymmetric or inclined double-crystal X-ray monochromator may be used for X-ray pulse compression if the pulse is properly chirped. By adjusting the mutual distance of the two asymmetric or inclined crystals it should be possible to achieve even a sub-femtosecond compression of a chirped free-electron laser pulse. The small d-spacing of the crystal enables a more compact scheme compared with the currently used grating compression scheme. The asymmetric cut of the crystal enables the acceptance of a larger bandwidth. The inclined cut has larger tunability.

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Dispersive spread of virtual sources by asymmetric X-ray monochromators

Cited by 23 publications

References 37 publications

Bragg coherent diffraction imaging and metrics for radiation damage in protein micro-crystallography

Bragg coherent diffraction imaging and metrics for radiation damage in protein micro-crystallography

X-ray diffraction microscopy: emerging imaging techniques for nondestructive analysis of crystalline materials from the millimetre down to the nanometre scale

Possibility of X-ray pulse compression using an asymmetric or inclined double-crystal monochromator

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