Imaging of objects by coherent diffraction of X-ray free-electron laser pulses

Richard A. Kirian, Henry N. Chapman

Research output: Chapter in Book/Report/Conference proceedingChapter

Abstract

X-ray free-electron lasers produce pulses of coherent X-rays that are up to nine orders of magnitude higher in peak brightness than the brightest synchrotron sources. These pulses vaporize any object placed in the focused beam, yet are brief enough to diffract from the object before significant radiation damage occurs. This process of “diffraction before destruction” overcomes previous exposure and dose limitations when imaging biological structures, which allows atomic-resolution structures to be determined from macromolecules without the need for large, strongly diffracting crystals that are difficult or impossible to grow. The extreme pulse intensity has allowed protein crystal sizes to be shrunk down to dimensions of hundreds of nanometers, expanding the range of structures that can be studied, potentially increasing the rate at which new structures can be determined, and allowing the tracking of conformational dynamics down to femtosecond timescales. Efforts are ongoing to reduce this all the way to the single molecule, opening up possibilities for robust phasing procedures to acquire model-free structures directly from the measurements. The new science of coherent diffractive imaging would be well understood by the Braggs and Laue but makes use of recent theoretical insights, modern computational capabilities, and the laser-like X-ray sources of the twenty-first century.

Original languageEnglish (US)
Title of host publicationSynchrotron Light Sources and Free-Electron Lasers
Subtitle of host publicationAccelerator Physics, Instrumentation and Science Applications
PublisherSpringer International Publishing
Pages1337-1397
Number of pages61
ISBN (Electronic)9783030232016
ISBN (Print)9783030232009
DOIs
StatePublished - Jan 1 2020

Keywords

  • Diffractive imaging
  • Iterative phase retrieval
  • X-ray diffraction
  • X-ray free-electron laser
  • X-ray microscopy

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Engineering(all)
  • Materials Science(all)
  • Chemistry(all)
  • Medicine(all)
  • Biochemistry, Genetics and Molecular Biology(all)

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