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Compact field emission (FE) scanning electron microscope (SEM) equipped with a multiwall carbon nanotube (MWCNT) emitter has been experimentally manufactured. An electrostatic extraction and focusing lens designated to the CNT field emitter was designed. Electron emission from a MWCNT was stable under a vacuum of 10−7 Pa even without a stabilization resistance. The maximum acceleration voltage was...
A commercial Bayard-Alpert ionization vacuum gauge was equipped with a field emission electron source based on a cathode consisting of an array of 16 gated, p-doped, and DLC-coated Si-tips and characterized. An anode current of about 1.3 μA led to an ion current of 7 fA at 3×10−7 mbar and 0.8 pA at 4×10−5 mbar. Whereas at pressures higher than 4×10−5 mbar the emission current of the electron source...
Here we present a reliable method for preparing a niobium nanoemitter, which is thermally and chemically stable. The tip apex is a (100) facet with a lateral dimension of ∼1 nm, surrounded by four (310) facets. This electron source will probably possess both spatial and temporal coherence if the emitter is cooled below the superconducting temperature of niobium.
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