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Related Concept Videos

Transmission Electron Microscopy01:15

Transmission Electron Microscopy

In 1931, physicist Ernst Ruska—building on the idea that magnetic fields can direct an electron beam just as lenses can direct a beam of light in an optical microscope—developed the first prototype of the electron microscope. This development led to the development of the field of electron microscopy. In the transmission electron microscope (TEM), electrons are produced by a hot tungsten element and accelerated by a potential difference in an electron gun, which gives them up to 400 keV in...
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Transmission electron microscopy (TEM) can be used to determine the 3D structure of biological samples with the help of techniques such as electron microscope tomography and single-particle reconstruction. While single-particle reconstruction can examine macromolecules and macromolecular complexes in vitro conditions only, tomography permits the study of cell components or small cells in vivo.
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Measurements of Long-range Electronic Correlations During Femtosecond Diffraction Experiments Performed on Nanocrystals of Buckminsterfullerene
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Ultracold electron source for single-shot, ultrafast electron diffraction.

S B van der Geer1, M J de Loos, E J D Vredenbregt

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

Microscopy and Microanalysis : the Official Journal of Microscopy Society of America, Microbeam Analysis Society, Microscopical Society of Canada
|July 7, 2009
PubMed
Summary
This summary is machine-generated.

A novel ultracold electron source offers orders of magnitude higher brightness for ultrafast electron diffraction (UED) studies. This advancement promises to enable single-shot structural dynamics research on biomolecular samples.

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Area of Science:

  • Atomic and Molecular Physics
  • Materials Science
  • Accelerator Physics

Background:

  • Ultrafast electron diffraction (UED) probes structural dynamics at atomic scales.
  • Current femtosecond laser photoemission sources lack the brightness for single-shot studies of complex samples like biomolecules.

Purpose of the Study:

  • To propose and investigate a novel ultracold electron source for enhanced UED experiments.
  • To achieve significantly higher electron beam brightness for advanced structural dynamics studies.

Main Methods:

  • Simulations using GPT tracking of realistic radio-frequency acceleration fields.
  • Inclusion of all pairwise Coulomb interactions in the simulations.
  • Utilizing near-threshold photoionization of laser-cooled and trapped atomic gas for electron generation.

Main Results:

  • Production of 120 keV, 0.1 pC electron bunches with sub-100 fs bunch lengths and 1% relative energy spread.
  • Achieved a transverse root-mean-square normalized emittance of 10 nm, surpassing current photoemission sources.
  • Identified correlations in transverse phase-space for potential further emittance improvement.

Conclusions:

  • The proposed ultracold electron source demonstrates orders of magnitude increase in brightness.
  • This technology is poised to enable single-shot UED studies of biomolecular samples.
  • Further emittance optimization could unlock unprecedented capabilities in structural dynamics research.