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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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Studying Dynamic Processes of Nano-sized Objects in Liquid using Scanning Transmission Electron Microscopy
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4D scanning ultrafast electron microscopy: visualization of materials surface dynamics.

Omar F Mohammed1, Ding-Shyue Yang, Samir Kumar Pal

  • 1Physical Biology Center for Ultrafast Science and Technology, Arthur Amos Noyes Laboratory of Chemical Physics, California Institute of Technology, Pasadena, California 91125, USA.

Journal of the American Chemical Society
|May 5, 2011
PubMed
Summary

Scanning ultrafast electron microscopy (S-UEM) achieves high spatiotemporal resolution for studying material surface dynamics. This new method overcomes limitations of conventional scanning electron microscopes (SEM) for ultrafast research.

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Area of Science:

  • Materials Science
  • Surface Science
  • Microscopy

Background:

  • Conventional scanning electron microscopes (SEM) have limited temporal resolution.
  • Studying ultrafast dynamics of material surfaces requires high temporal resolution.

Purpose of the Study:

  • To develop scanning ultrafast electron microscopy (S-UEM) for time-resolved studies.
  • To achieve high resolution in both space and time for surface dynamics.

Main Methods:

  • Developed S-UEM using photogenerated electron packets from a field-emitter tip.
  • Utilized a low electron count to minimize space-charge repulsion and enhance temporal resolution.
  • Maintained SEM's spatial resolution for spatiotemporal visualization.

Main Results:

  • Demonstrated S-UEM for investigating dynamics in semiconducting and metallic materials.
  • Achieved ultrashort temporal resolution, orders of magnitude better than traditional methods.
  • Enabled visualization of surface dynamics following femtosecond excitation.

Conclusions:

  • S-UEM offers unprecedented spatiotemporal resolution for materials science.
  • The technique is capable of visualizing ultrafast surface dynamics.
  • Potential applications exist in materials and biological sciences.