ELECTRON RADIATING CATHODE

PROBLEM TO BE SOLVED: To provide an electron radiating cathode which is appropriate for being used for an Auger electron spectroscope, etc., and keeps a low rate of the total radiating current in spite of its operation at a high-angle current density. SOLUTION: The electron radiating cathode specifi...

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Bibliographische Detailangaben
Hauptverfasser:	TERUI YOSHINORI, KUDO NAOYA, TSUNODA KATSUYOSHI
Format:	Patent
Sprache:	eng
Schlagworte:	BASIC ELECTRIC ELEMENTS ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR ELECTRICITY SEMICONDUCTOR DEVICES
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To provide an electron radiating cathode which is appropriate for being used for an Auger electron spectroscope, etc., and keeps a low rate of the total radiating current in spite of its operation at a high-angle current density. SOLUTION: The electron radiating cathode specifies that the total radiating current is 350 μA or less when this is operated at a 1.0 mA/sr angle current density in the case where the single crystal needle of tungsten or molybdenum is provided with a coating layer of hafnium and oxygen. Concretely, the curvature radius at the edge of the single crystal needle is 0.8 to 2.0 μm.