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Transmission Electron Microscopy01:15

Transmission Electron Microscopy

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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...
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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.
Electron Tomography
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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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To be visualized by an electron microscope, either transmission or scanning, biological samples need to be fixed (stabilized) so the electron beam does not destroy them and dried thoroughly (desiccated/dehydrated) so the vacuum does not affect them. Fixation needs to be done as quickly as possible because the sample properties will start changing as soon as it is removed from its natural environment. For example, in a tissue sample, the oxygen levels begin decreasing, causing an altered...
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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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Atomic emission spectroscopy (AES) is an analytical technique used to determine the elemental composition of a sample by analyzing the light emitted from excited atoms. In AES, atoms in a sample are excited to higher energy levels by thermal energy from high-temperature sources, such as plasma, arcs, or sparks. When these excited atoms return to lower energy states, they emit light at specific wavelengths characteristic of each element. The resulting atomic emission spectrum, which consists of...
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In Situ Detection and Single Cell Quantification of Metal Oxide Nanoparticles Using Nuclear Microprobe Analysis
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Isotope analysis in the transmission electron microscope.

Toma Susi1, Christoph Hofer1, Giacomo Argentero1

  • 1Faculty of Physics, University of Vienna, Faculty of Physics, Boltzmanngasse 5, 1090 Vienna, Austria.

Nature Communications
|October 11, 2016
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Summary
This summary is machine-generated.

Researchers can now distinguish between isotopes of elements using electron microscopy. This new method quantifies atom ejection probability, enabling precise isotope mapping in materials like graphene.

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Area of Science:

  • Materials Science
  • Physics
  • Chemistry

Background:

  • Scanning transmission electron microscopy (STEM) visualizes atomic structures but cannot differentiate isotopes.
  • Distinguishing isotopes is crucial for understanding material properties and nuclear processes.

Purpose of the Study:

  • To develop a method for differentiating between isotopes of the same element using electron microscopy.
  • To quantify isotope concentration with high spatial resolution.

Main Methods:

  • Quantifying the probability of energetic imaging electrons ejecting atoms.
  • Measuring displacement probability in graphene samples enriched with specific carbon isotopes (12C and 13C).
  • Utilizing quantum mechanical models of lattice vibrations and density functional theory simulations.

Main Results:

  • Successfully differentiated between 12C and 13C isotopes in graphene.
  • Developed a method to map isotope concentration with a precision better than 20% in mixed samples.
  • Demonstrated the technique's applicability to non-ideal, atomically imprecise interfaces.

Conclusions:

  • The developed method allows for isotopic analysis using atomic resolution transmission electron microscopy.
  • This technique opens new avenues for materials characterization and isotope studies.
  • The method is potentially applicable to various low-dimensional materials and electron microscopy techniques.