Radiant energy – Ion generation – Field ionization type
Patent
1995-07-31
1997-04-01
Berman, Jack I.
Radiant energy
Ion generation
Field ionization type
250423R, 313336, 313346R, H01J 302
Patent
active
056169264
ABSTRACT:
A Schottky emission cathode has a filament, a needle-shaped piece of single crystal refractory metal which is attached to the filament and has a flat crystal surface at a tip thereof, and an adsorbed layer including at least one kind of a metal other than the single crystal refractory metal on the flat crystal surface. The piece of single crystal refractory metal is heated by passing a current through the filament and electrons are extracted by an electric field applied on a tip of the needle-shaped piece of single crystal refractory metal. The tip of the needle-shaped piece of single crystal refractory metal as a radius of curvature of a value to produce an energy width among electrons extracted from the tip not exceeding a predetermined value when the electric field is sufficient to prevent the flat crystal surface from collapsing during operation of the cathode.
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Fukuhara Satoru
Kimura Shingo
Kuroda Katsuhiro
Ohshima Takashi
Shinada Hiroyuki
Berman Jack I.
Hitachi , Ltd.
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