Electron gun field emission

The Physical Electronics 680 Nanoprobe employs a field emission electron gun, and this results in a spatial resolution of less than lOnm. Ion bombardment for depth profiling is available in the SAM, and both the electron beam and the ion beam are computer controlled so that depth profiles can be run automatically, and maps and line scan of Auger electron distributions can be generated. 

Field emission electron guns for electron microscopes... 

Another consideration is the choice of electron sources. The field emission electron guns provide better lateral coherence, smaller probes, and higher brightness in general than the thermionic source they are more suitable for CBED and NED. 

FIG. 3 Field emission electron gun-scanning electron microscope (FEG-SEM) picture of air-dried collagen fibrils (x 160,000). (From Ref 2.)... 

Glassy carbons (GCs), obtained by pyrolysis and heat treatment of thermosetting resins above 1000°C, are hard and brittle materials that fail suddenly when loaded in tension or compression. In commercially available GCs, the mean grain diameter, evaluated from micrographs under a field-emission electron gun type scanning electron microscopy, and the crystallite sizes, calculated from X-ray powder diffraction profiles, both slightly increased with the elevation of heat treatment tempera-ture(HTT) from 1000°C to 3000°C. ... 

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