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Related Concept Videos

Determination of Crystal Structures01:29

Determination of Crystal Structures

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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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Updated: Mar 13, 2026

Quantitative Atomic-Site Analysis of Functional Dopants/Point Defects in Crystalline Materials by Electron-Channeling-Enhanced Microanalysis
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Single Crystal Diamond Needle as Point Electron Source.

Victor I Kleshch1, Stephen T Purcell2, Alexander N Obraztsov1,3

  • 1Department of Physics, M.V. Lomonosov Moscow State University, Moscow 119991, Russia.

Scientific Reports
|October 13, 2016
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Summary
This summary is machine-generated.

This study introduces single crystal diamond needles for point electron sources, overcoming limitations of traditional diamond emitters. These novel emitters show promising characteristics for vacuum electronics applications.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Vacuum Electronics

Background:

  • Diamond is a highly attractive material for cold-cathode applications.
  • Current applications are limited by the need for nanometer-sized or defective crystallites.
  • Ideal diamond properties are not typically utilized in existing electron emitters.

Purpose of the Study:

  • To report the first use of single crystal diamond emitters with high aspect ratio as point electron sources.
  • To investigate the field emission properties of these novel diamond structures.

Main Methods:

  • Single crystal diamond needles were fabricated via selective oxidation of polycrystalline diamond films.
  • Plasma-enhanced chemical vapor deposition (PECVD) was used to produce the initial films.
  • Field emission currents and electron energy distributions were measured as a function of voltage and temperature.

Main Results:

  • The diamond needles exhibited current saturation and temperature sensitivity.
  • Conduction was found to be surface-mediated.
  • The transport mechanism was identified as Poole-Frenkel, with trap energies of 0.2-0.3 eV.

Conclusions:

  • Single crystal diamond needles offer a promising approach for advanced point electron sources.
  • The observed temperature-sensitive field emission characteristics are valuable for vacuum electronics.
  • These findings pave the way for improved electron beam sources and sensors.