Field Emission from a New Type of Electron Source
نویسنده
چکیده
A new type of field emission electron source has been developed. In this paper, the construction, characteristics and behviour of tungsten micropoint emitters coated with a suh ic ron layer of hyd-rbon using a TEN with poor (tom) vacuum conditions are described. The hydrocarbon coating has been verified using the X-Ray energy dispersive analysis technique of a SEM. The technical capabilities and potential of the new type of electron source are compared with those of other comparable composite micropoint field emitters and other types of electrun sources currently in use. The emission properties presented here include I-V characteristics, emission images and electron energy spectra of this type of composite micropoint emitters. The effect on the behadour and characteristics of baking the coated emitters a t temperatures ranging between 140" C and 350" C i s also s tud id The behaviour of the emitter has been interpreted in terms of a field-indud hot-electron emission mechanism associated with metal-insulsatorvacuum (M-I-V) regime.
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