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Related Concept Videos

Determination of Crystal Structures01:29

Determination of Crystal Structures

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In the late 1800s, the revelation that light extended beyond visible wavelengths led to the discovery of X-rays by Wilhelm Roentgen. Recognized as high-energy electromagnetic radiation with short wavelengths, X-rays prompted exploration into their interaction with crystals. Max von Laue proposed in 1912 that the periodic arrangement of atoms, ions, or molecules in crystals would cause them to diffract X-rays, a hypothesis confirmed through experiments with copper sulfate and zinc sulfide...
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Measurements of Long-range Electronic Correlations During Femtosecond Diffraction Experiments Performed on Nanocrystals of Buckminsterfullerene
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Ultrafast electron diffraction using an ultracold source.

M W van Mourik1, W J Engelen1, E J D Vredenbregt

  • 1Department of Applied Physics, Eindhoven University of Technology , P.O. Box 513, 5600 MB Eindhoven, The Netherlands.

Structural Dynamics (Melville, N.Y.)
|January 23, 2016
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Summary
This summary is machine-generated.

We developed an ultracold electron source for macromolecular crystallography. This source provides high coherence electron beams, crucial for studying complex crystal structures and advancing protein crystal diffraction.

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Area of Science:

  • Atomic, Molecular, and Optical Physics
  • Materials Science
  • Crystallography

Background:

  • Studying complex macromolecular crystals requires electron beams with high coherence and charge.
  • Existing electron sources face limitations in achieving the necessary beam properties for advanced crystallography.

Purpose of the Study:

  • To present diffraction patterns from graphite using an ultracold electron source.
  • To demonstrate the tunability and coherence of electron bunches generated from laser-cooled atomic gases.
  • To confirm the suitability of this ultracold source for protein crystal diffraction.

Main Methods:

  • Utilized femtosecond near-threshold photoionization of a laser-cooled atomic gas to generate electron bunches.
  • Employed graphite as a test sample to obtain diffraction patterns.
  • Varied the photoionization wavelength to control the effective source temperature (10 K to 300 K).

Main Results:

  • Successfully obtained diffraction patterns from graphite using the ultracold electron source.
  • Observed a change in diffraction peak width correlating with the effective source temperature.
  • Demonstrated consistency between measured diffraction peak widths and independently determined source parameters.

Conclusions:

  • The study directly measures the beam coherence of the ultracold electron source.
  • The results confirm the source's suitability for demanding applications like protein crystal diffraction.
  • This ultracold electron source offers a promising new tool for structural dynamics studies.