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Schottky-emitter electron source of an Electron microscope. A field emission gun (FEG) is a type of electron gun in which a sharply pointed Müller-type [clarification needed] emitter [1]: 87–128 is held at several kilovolts negative potential relative to a nearby electrode, so that there is sufficient potential gradient at the emitter surface to cause field electron emission.
fe: Lagrange (order 1-7), Hermite (order 3-7), discontinuous Lagrange (order 0-7), bubble, Gauss point, serendipity, Nedelec Arbitrary-order Lagrange elements (continuous and discontinuous), Bernstein basis, Nedelec and Raviart-Thomas elements, support for NURBS spaces (IGA)
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The first electron microscope (EM) observation of an individual atom was made by Crewe, Wall and Langmore in 1970, [35] using a scanning electron microscope equipped with an early field emission gun. From the 1950s onwards, extensive effort has been devoted to the development of field emission sources for use in electron guns .
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The Schottky effect or field enhanced thermionic emission is a phenomenon in condensed matter physics named after Walter H. Schottky.In electron emission devices, especially electron guns, the thermionic electron emitter will be biased negative relative to its surroundings.
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