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Phase Contrast and Differential Interference Contrast Microscopy01:26

Phase Contrast and Differential Interference Contrast Microscopy

Phase-Contrast Microscopes
In-phase-contrast microscopes, interference between light directly passing through a cell and light refracted by cellular components is used to create high-contrast, high-resolution images without staining. It is the oldest and simplest type of microscope that creates an image by altering the wavelengths of light rays passing through the specimen. Altered wavelength paths are created using an annular stop in the condenser. The annular stop produces a hollow cone of...
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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.
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Simulation study on image contrast and spatial resolution in helium ion microscope.

Kensuke Inai1, Kaoru Ohya, Tohru Ishitani

  • 1Department of Advanced Technology and Science, The University of Tokushima, Minamijosanjima-cho 2-1, Tokushima 770-8506, Japan. ken-171@ee.tokushima-u.ac.jp

Journal of Electron Microscopy
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Summary
This summary is machine-generated.

Helium ion microscopy offers superior image contrast and resolution compared to scanning electron microscopy. This is due to helium ions generating secondary electrons more efficiently and with a smaller excitation volume.

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Area of Science:

  • Materials Science
  • Surface Science
  • Microscopy

Background:

  • Secondary electron (SE) emission is crucial for imaging in microscopy.
  • Comparing SE emission characteristics between different ion and electron beams is essential for optimizing imaging techniques.

Purpose of the Study:

  • To compare secondary electron image characteristics between helium (He) ion microscopes (SIM) and scanning electron microscopes (SEM).
  • To investigate the factors influencing secondary electron yield and spatial resolution in He-SIM.

Main Methods:

  • Monte Carlo simulations were employed to model He ion induced secondary electron emission.
  • Simulations analyzed SE yield and its dependence on target atomic number (Z2) and incident angle.

Main Results:

  • He ion bombardment shows a gradual increase in SE yield with Z2, unlike Ga ion bombardment which exhibits an opposite trend.
  • SE yield for He ions is significantly higher than for electrons or Ga ions.
  • Incident angle dependence of SE yield for He ions follows the inverse cosine law, even at high angles, leading to clearer image contrast in He-SIM compared to SEM.

Conclusions:

  • He-SIM provides clearer image contrast than SEM due to distinct SE emission properties.
  • Recoil target atoms, rather than excited electrons, dominate SE yield in He-SIM.
  • High spatial resolution (<0.1 nm) is projected for He-SIM, surpassing that of Ga ion and electron beams.