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- W3036977162 abstract "Although the cold field emission gun has been used successfully for both transmission and scanning electron microscopy it requires ultra-high vacuum which is not obtained easily when such a gun is interfaced to a conventional microscope system. Recently, the thermal field emission gun (TFEG) in which the emitting tip is held at around 1700°K has been proposed as an alternative electron source for such applications. Under this condition the tip is cleaned continuously, and surface asperities are smoothed, therefore stable operation is possible in a high vacuum. In this paper we report on the build-up characteristics, current stability and brightness of a TFEG which has been interfaced to a JEOL JEM 100B microscope equipped with a scanning attachment. The gun consists of a (111) tungsten emitter set on a rhenium filament, three anodes and a two stage magnetic alignment system. The gun chamber is ion pumped to a pressure in the range 6xl0 -8 to 2xl0 -9 torr." @default.
- W3036977162 created "2020-06-25" @default.
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- W3036977162 date "1975-01-01" @default.
- W3036977162 modified "2023-09-24" @default.
- W3036977162 title "The Performance of a Thermal Field Emission Gun" @default.
- W3036977162 cites W1980710081 @default.
- W3036977162 doi "https://doi.org/10.1017/s0424820100114359" @default.
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