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Related Concept Videos

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.
Electron Microscope Tomography and Single-particle Reconstruction01:07

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
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X-ray Diffraction of Biological Samples01:10

X-ray Diffraction of Biological Samples

X-ray diffraction or XRD is an analytical tool that utilizes X-rays to study ordered structures such as crystalline organic and inorganic samples, polycrystalline materials, proteins, carbohydrates, and drugs.
According to Bragg's law, when X-rays strike the sample positioned on a stage, the rays are  scattered by the electron clouds around the sample atoms. The  X-ray diffraction or scattering is caused by constructive interference of the X-ray waves that reflect off the internal crystal...
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.
Fundamental Principles
Accelerated...
X-ray Crystallography02:18

X-ray Crystallography

The size of the unit cell and the arrangement of atoms in a crystal may be determined from measurements of the diffraction of X-rays by the crystal, termed X-ray crystallography.
Diffraction
Diffraction is the change in the direction of travel experienced by an electromagnetic wave when it encounters a physical barrier whose dimensions are comparable to those of the wavelength of the light. X-rays are electromagnetic radiation with wavelengths about as long as the distance between neighboring...
Determination of Crystal Structures01:29

Determination of Crystal Structures

In the late 1800s, the revelation that light extended beyond visible wavelengths led to the discovery of X-rays by Wilhelm Roentgen. Recognized as high-energy electromagnetic radiation with short wavelengths, X-rays prompted exploration into their interaction with crystals. Max von Laue proposed in 1912 that the periodic arrangement of atoms, ions, or molecules in crystals would cause them to diffract X-rays, a hypothesis confirmed through experiments with copper sulfate and zinc sulfide...

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Related Experiment Video

Updated: May 25, 2026

Microcrystal Electron Diffraction of Small Molecules
09:48

Microcrystal Electron Diffraction of Small Molecules

Published on: March 15, 2021

Electrons for single molecule diffraction and imaging.

Ke Ran1, Jian-Min Zuo, Qing Chen

  • 1Department of Material Science and Engineering and Materials Research Laboratory, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA.

Ultramicroscopy
|January 17, 2012
PubMed
Summary
This summary is machine-generated.

Electrons show promise for single molecule imaging and diffraction. Using fullerene molecules (C₆₀) inside carbon nanotubes, researchers explored electron molecular diffraction limits for advanced imaging techniques.

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Last Updated: May 25, 2026

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Area of Science:

  • Materials Science
  • Chemistry
  • Physics

Background:

  • Single-molecule imaging is crucial for understanding molecular behavior.
  • Electron diffraction offers high resolution but faces challenges with small samples.
  • Fullerene molecules (C₆₀) confined in carbon nanotubes (peapods) serve as a model system.

Purpose of the Study:

  • To demonstrate the potential of electrons for single molecule diffraction and imaging.
  • To explore the limits and sensitivity of electron molecular diffraction.
  • To determine the optimal approach for single molecule imaging.

Main Methods:

  • Utilizing a 25 nm electron beam from a field emission gun source.
  • Recording diffraction patterns from individual C₆₀s@SWCNT (peapod) samples using imaging plates.
  • Employing computational simulations to analyze diffraction data and molecular configurations.

Main Results:

  • Electron diffraction patterns were successfully recorded from individual peapods.
  • Diffraction from C₆₀ molecules was observed in approximately 15% of the host nanotubes.
  • Simulations helped define the sensitivity of electron molecular diffraction to molecular arrangements.

Conclusions:

  • Electrons hold significant potential for single molecule diffraction and imaging.
  • Combining electron diffraction with direct electron imaging offers the most effective strategy for single molecule visualization.
  • This study advances the capabilities for probing molecular structures at the nanoscale.