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An electron microscope is a microscope that uses a beam of electrons as a source of illumination. They use electron optics that are analogous to the glass lenses of an optical light microscope to control the electron beam, for instance focusing them to produce magnified images or electron diffraction patterns.
Precession electron diffraction (PED) is a specialized method to collect electron diffraction patterns in a transmission electron microscope (TEM). By rotating (precessing) a tilted incident electron beam around the central axis of the microscope, a PED pattern is formed by integration over a collection of diffraction conditions.
Clinton Joseph Davisson (October 22, 1881 – February 1, 1958) was an American physicist who won the 1937 Nobel Prize in Physics for his discovery of electron diffraction in the famous Davisson–Germer experiment.
22 de mai. de 2018 · Media in category "Electron diffraction" The following 50 files are in this category, out of 50 total. A565 G P Thomson Electron Diffraction.jpg 1,525 × 1,536; 159 KB
Neutron diffraction can therefore reveal the microscopic magnetic structure of a material. [4] Magnetic scattering does require an atomic form factor as it is caused by the much larger electron cloud around the tiny nucleus. The intensity of the magnetic contribution to the diffraction peaks will therefore decrease towards higher angles.
Similar diffraction patterns can be produced by related scattering techniques such as electron diffraction or neutron diffraction. If single crystals of sufficient size cannot be obtained, various other X-ray methods can be applied to obtain less detailed information; such methods include fiber diffraction , powder diffraction and (if the sample is not crystallized) small-angle X-ray ...
Bei der medium energy electron diffraction (MEED) beobachtet man das Multilagen-Oberflächenwachstum in Abhängigkeit von der Zeit mit Elektronenbeugung. Wachsen die Schichten Monolage für Monolage auf der Oberfläche (Frank-van-der-Merwe-Wachstum), dann ändert sich der Ordnungsgrad der Oberfläche periodisch.
