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Title: Improved crystal orientation and physical properties from single-shot XFEL stills

Journal Article · · Acta Crystallographica. Section D: Biological Crystallography (Online)

X-ray diffraction patterns from still crystals are inherently difficult to process because the crystal orientation is not uniquely determined by measuring the Bragg spot positions. Only one of the three rotational degrees of freedom is directly coupled to spot positions; the other two rotations move Bragg spots in and out of the reflecting condition but do not change the direction of the diffracted rays. This hinders the ability to recover accurate structure factors from experiments that are dependent on single-shot exposures, such as femtosecond diffract-and-destroy protocols at X-ray free-electron lasers (XFELs). Here, additional methods are introduced to optimally model the diffraction. The best orientation is obtained by requiring, for the brightest observed spots, that each reciprocal-lattice point be placed into the exact reflecting condition implied by Bragg's law with a minimal rotation. This approach reduces the experimental uncertainties in noisy XFEL data, improving the crystallographic R factors and sharpening anomalous differences that are near the level of the noise.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1213563
Journal Information:
Acta Crystallographica. Section D: Biological Crystallography (Online), Vol. 70, Issue 12; ISSN 1399-0047
Publisher:
International Union of CrystallographyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 31 works
Citation information provided by
Web of Science

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Cited By (9)

Climbing the Data Mountain: Processing of SFX Data book January 2018
Architecture of the synaptotagmin–SNARE machinery for neuronal exocytosis journal August 2015
Structure of photosystem II and substrate binding at room temperature journal November 2016
Structures of the intermediates of Kok’s photosynthetic water oxidation clock journal November 2018
Nanoscale mosaicity revealed in peptide microcrystals by scanning electron nanodiffraction journal January 2019
Data-driven challenges and opportunities in crystallography journal July 2019
Unsupervised determination of protein crystal structures journal May 2019
A nanosecond time-resolved XFEL analysis of structural changes associated with CO release from cytochrome c oxidase journal July 2017
Climbing the Data Mountain: Processing of SFX Data text January 2018

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