Electron impact ion source with field emission cathode

Details Electron impact ion source with field emission cathode Electron impact ion source with field emission cathode

1979-03-08

1981-06-09

Demeo, Palmer C.

Electric lamp and discharge devices

With positive or negative ion acceleration

Plural apertured electrodes

250427, 313309, 313336, 313363, H01J 37073, H01J 3708, H01J 4914, H01J 1924

Patent

active

042726999

ABSTRACT:
A field emission cathode affording multiple emitting points, formed by a tiplicity of carbon fibers mounted on a conductive base, preferably in spaced clusters of about one thousand or more fibers, and projecting from the base to afford a multiplicity of emission points at the fiber tips. The fibers are in a range of diameters of about two to ten microns. As applied to an electron impact ion source for an instrument such as a mass spectrometer or molecular beam detector, the cathode is of annular configuration, incorporated in an electrode assembly comprising, radially inwardly of the assembly, the cathode, an extraction grid, a retardation grid and an ionization cage.

REFERENCES:
patent: 220248 (1879-10-01), Manning
patent: 3274436 (1966-09-01), Reich
patent: 3883760 (1975-05-01), Cunningham, Jr.
patent: 3913520 (1975-10-01), Berg et al.

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