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- W3036767054 abstract "The superiority of field emission electron sources for high resolution electron microscopy, as originally developed by Crewe et al, is well understood. A number of commercially available SEMs of satisfactory quality have taken advantage of the small energy spread and high relative brightness of the FE source. More recently, AMRAY has introduced high resolution field emission SEMs which take advantage of alternative configurations for the electron source and the electron optics of the column. The cold (room temperature) FE source has been replaced with ZrO/W FE sources operating in the Schottky mode. These sources have proven to be a practical alternative to cold FE for both high resolution and high incident current applications. The zirconiated source requires no periodic flashing to clean the emitter tip since it operates continuously at a temperature of the order of 1800° K. The ZrO/W gun current is an order of magnitude higher than that of the cold source, it exhibits even higher angular brightness, and operates stably at a vacuum of 10 -9 torr, an order of magnitude poorer in pressure than that required for cold FE sources." @default.
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- W3036767054 date "1989-08-06" @default.
- W3036767054 modified "2023-10-17" @default.
- W3036767054 title "Electron optical improvements for field emission SEMS" @default.
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- W3036767054 doi "https://doi.org/10.1017/s0424820100152434" @default.
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