SCANNING ELECTRON MICROSCOPY

Electron Detector

Electron Detector: There are two kinds of electrons coming out from the sample in an SEM, the backscattered electrons, with higher energies being larger or lower than the primary beam energy and secondary electrons which have energies of a few eV or less than a few tens of eV. The most common kind of detector […]

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Electron lens

Electron lens:                 An electromagnetic lens is used in electron microscopy. This consists of a coil of wire generating a magnetic field enclosed in iron casing. A magnetic field undergoes rotation. As the radial component of the magnetic field reverses after the centre of the lens, the rotation of the first half of the lens […]

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Electron gun

Electron gun: The electron gun provides a stable beam of electron.  The most common form of an electron gun is a thermionic emitter, wherein the work function of the metal is overcome by the surface temperature of the filament.   Typically, a hairpin filament made of a tungsten wire of 100μm, with a tip radius of […]

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