The Thermo Fisher Apreo 2 Variable Pressure Field Emission Scanning Electron Microscope (FE-SEM) is a thermionic field emission high resolution scanning electron microscope. The Apreo 2 FE-SEM is an ...

The field emission SEM (FE-SEM) is capable of reaching a magnification ... high resolution imaging. In scanning electron microscopy, a thermionic electron source such as a tungsten filament is usually ...

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To be sure, there are still applications for thermionic emission, especially in power electronics and specialized switching applications. But by and large, progress has left vacuum tubes in a ...