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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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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.
Mass Analyzers: Common Types01:19

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The quadrupole mass analyzer consists of four cylindrical metal rods arranged in a diamond carrying a DC voltage and a radio-frequency AC voltage. The motion of ions through the quadrupole depends on the field strength, causing only ions of a certain m/z to resonate successfully and strike the detector at a given field strength. Though the transmission rate for these analyzers is high, the exact elemental composition of the sample is not determined because of low resolution; however, they are...
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The early pioneers of microscopy opened a window into the invisible world of microorganisms. In 1830, Joseph Jackson Lister created an essentially modern light microscope. The 20th century saw the development of microscopes that leveraged nonvisible light, such as fluorescence microscopy that uses an ultraviolet light source and electron microscopy that uses short-wavelength electron beams. These advances significantly improved magnification, image resolution, and contrast. By comparison, the...
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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Scanning electron microscope electron detector with a radial type discrete dynode electron multiplier.

J Hejna1

  • 1Institute of Material Science and Applied Mechanics, Wrocław University of Technology, Smoluchowskiego 25, 50-370 Wrocław, Poland. jan.hejna@pwr.wroc.pl

Journal of Microscopy
|November 20, 2008
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Summary

A novel electron multiplier efficiently detects topographic contrast using backscattered electrons in low-voltage scanning electron microscopy. This detector offers a large collection angle for enhanced imaging capabilities.

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Area of Science:

  • Physics
  • Materials Science
  • Electron Microscopy

Background:

  • Backscattered electron detectors are crucial for topographic contrast in scanning electron microscopy.
  • Existing detectors have limitations in collection angle and efficiency.

Purpose of the Study:

  • To develop and test a discrete dynode electron multiplier for enhanced backscattered electron detection.
  • To evaluate its performance in low-voltage scanning electron microscopy for topographic contrast imaging.

Main Methods:

  • Theoretical study of dynode shapes using particle optics software.
  • Experimental construction and testing of three multiplier assemblies.
  • Measurement of gain, electron type, spatial collection efficiency, and signal-to-noise ratio.

Main Results:

  • The discrete dynode multiplier demonstrated effective detection of backscattered electrons for topographic contrast.
  • Optimized dynode shapes were identified through theoretical and experimental analysis.
  • The detector achieved a large solid collection angle, improving signal acquisition.

Conclusions:

  • The developed electron multiplier is a promising detector for low-voltage scanning electron microscopy.
  • It offers significant advantages in topographic contrast imaging due to its design and performance.
  • Further optimization could enhance its application in various electron microscopy techniques.