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Related Concept Videos

Scanning Electron Microscopy01:07

Scanning Electron Microscopy

A scanning electron microscope (SEM) is used to study the surface features of a sample by using an electron beam that scans the sample surface in a two-dimensional manner. Typically, areas between ~1 centimeter to 5 micrometers in width can be imaged. SEM can be used to image bacteria, viruses, tissues as well as larger samples like insects. Conventional SEM gives a magnification ranging from 20X to 30,000X and spatial resolution of 50 to 100 nanometers.
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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...
Overview of Electron Microscopy01:25

Overview of Electron Microscopy

The wavelengths of visible light ultimately limit the maximum theoretical resolution of images created by light microscopes. Most light microscopes can only magnify 1000X, and a few can magnify up to 1500X. Electrons, like electromagnetic radiation, can behave like waves, but with wavelengths of 0.005 nm, they produce significantly greater resolution up to 0.05 nm as compared to 500 nm for visible light. An electron microscope (EM) can create a sharp image that is magnified up to 2,000,000X.
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Electron Microscope Tomography and Single-particle Reconstruction

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.
Electron Tomography
Electron tomography can be performed either in TEM or STEM (scanning transmission...

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Measurements of Long-range Electronic Correlations During Femtosecond Diffraction Experiments Performed on Nanocrystals of Buckminsterfullerene
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A pulsed electron gun for ultrafast electron diffraction at surfaces.

A Janzen1, B Krenzer, O Heinz

  • 1Department of Physics and Centre for Nanointegration CeNIDE, University of Duisburg-Essen, 47048 Duisburg, Germany. andreas.janzen@uni-due.de

The Review of Scientific Instruments
|May 17, 2007
PubMed
Summary

A new pulsed electron gun was developed for ultrafast electron diffraction experiments. This system utilizes a novel photocathode, achieving electron pulses under 6 picoseconds for advanced surface science studies.

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Area of Science:

  • Surface Science
  • Materials Science
  • Physical Chemistry

Background:

  • Ultrafast reflection high-energy electron diffraction (U-RFHEED) requires precisely controlled electron pulses.
  • Existing electron guns face limitations in temporal resolution and pulse duration for surface dynamics studies.

Purpose of the Study:

  • To report the construction and characterization of a novel pulsed electron gun for U-RFHEED experiments.
  • To optimize electron pulse generation and control for femtosecond surface analysis.

Main Methods:

  • Fabrication of a photocathode using a 10 nm thin gold (Au) film on a sapphire substrate.
  • Generation of electron pulses via femtosecond ultraviolet laser illumination of the photocathode.
  • Acceleration of photoelectrons to 15 keV and focusing using an electrostatic lens.

Main Results:

  • Homogeneous photoelectron emission from the Au photocathode with a narrow energy distribution (0.1 eV width).
  • Achieved electron pulse durations of less than 6 picoseconds.
  • Demonstrated suitability for U-RFHEED experiments with a temporal resolution determined by electron transit time (approx. 30 ps).

Conclusions:

  • The developed pulsed electron gun meets the requirements for ultrafast surface electron diffraction.
  • The novel photocathode design enables high-quality, short-duration electron pulses for advanced surface science.
  • This technology advances the study of ultrafast dynamics at surfaces.