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Direct phasing in femtosecond nanocrystallography. I. Diffraction characteristics

Direct phasing in femtosecond nanocrystallography. I. Diffraction characteristics X‐ray free‐electron lasers solve a number of difficulties in protein crystallography by providing intense but ultra‐short pulses of X‐rays, allowing collection of useful diffraction data from nanocrystals. Whereas the diffraction from large crystals corresponds only to samples of the Fourier amplitude of the molecular transform at the Bragg peaks, diffraction from very small crystals allows measurement of the diffraction amplitudes between the Bragg samples. Although highly attenuated, these additional samples offer the possibility of iterative phase retrieval without the use of ancillary experimental data [Spence et al. (2011). Opt. Express, 19, 2866–2873]. This first of a series of two papers examines in detail the characteristics of diffraction patterns from collections of nanocrystals, estimation of the molecular transform and the noise characteristics of the measurements. The second paper [Chen et al. (2014). Acta Cryst. A70, 154–161] examines iterative phase‐retrieval methods for reconstructing molecular structures in the presence of the variable noise levels in such data. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Acta Crystallographica Section A Foundations of Crystallography Wiley

Direct phasing in femtosecond nanocrystallography. I. Diffraction characteristics

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References (33)

Publisher
Wiley
Copyright
Copyright © 2014 Wiley Subscription Services, Inc., A Wiley Company
ISSN
0108-7673
eISSN
1600-5724
DOI
10.1107/S2053273313032038
pmid
24572315
Publisher site
See Article on Publisher Site

Abstract

X‐ray free‐electron lasers solve a number of difficulties in protein crystallography by providing intense but ultra‐short pulses of X‐rays, allowing collection of useful diffraction data from nanocrystals. Whereas the diffraction from large crystals corresponds only to samples of the Fourier amplitude of the molecular transform at the Bragg peaks, diffraction from very small crystals allows measurement of the diffraction amplitudes between the Bragg samples. Although highly attenuated, these additional samples offer the possibility of iterative phase retrieval without the use of ancillary experimental data [Spence et al. (2011). Opt. Express, 19, 2866–2873]. This first of a series of two papers examines in detail the characteristics of diffraction patterns from collections of nanocrystals, estimation of the molecular transform and the noise characteristics of the measurements. The second paper [Chen et al. (2014). Acta Cryst. A70, 154–161] examines iterative phase‐retrieval methods for reconstructing molecular structures in the presence of the variable noise levels in such data.

Journal

Acta Crystallographica Section A Foundations of CrystallographyWiley

Published: Mar 1, 2014

Keywords: ; ; ; ;

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