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The indexing methods currently used for serial femtosecond crystallography were originally developed for experiments in which crystals are rotated in the X-ray beam, providing significant three-dimensional information. On the other hand, shots from both X-ray free-electron lasers and serial synchrotron crystallography experiments are still images, in which the few three-dimensional data available arise only from the curvature of the Ewald sphere. Traditional synchrotron crystallography methods are thus less well suited to still image data processing. Here, a new indexing method is presented with the aim of maximizing information use from a still image given the known unit-cell dimensions and space group. Efficacy for cubic, hexagonal and orthorhombic space groups is shown, and for those showing some evidence of diffraction the indexing rate ranged from 90% (hexagonal space group) to 151% (cubic space group). Here, the indexing rate refers to the number of lattices indexed per image.

Original publication

DOI

10.1107/s2059798316010706

Type

Journal article

Journal

Acta crystallographica. Section D, Structural biology

Publication Date

08/2016

Volume

72

Pages

956 - 965

Addresses

Division of Structural Biology, Wellcome Trust Centre for Human Genetics, Roosevelt Drive, Oxford OX3 7BN, England.

Keywords

Proteins, Crystallography, Crystallography, X-Ray, Lasers, Protein Conformation, Algorithms, Electrons, Synchrotrons, X-Rays, Time Factors