Ion source

Details Ion source Ion source

1982-06-07

1984-06-05

Smith, Alfred E.

Radiant energy

Ion generation

With sample vaporizing means

313163, 313232, 3133621, 31511181, 250427, H01J 2722

Patent

active

044530781

ABSTRACT:
A reservoir, extracting electrode and circular tungsten filament are maintained at high positive D.C. potential relative to a grounded electrode. Thermal electrons emanated from the filament irradiates and heats the bottom of the reservoir. As a result, powdered CsI held in the reservoir is melted and then forms a liquid CsI cone-shaped portion below the capillary formed at the reservoir bottom. Vaporized CsI molecules are created by further heating the cone-shaped portion, and are ionized by electron beam irradiation, so that a Cs.sup.+ ion beam is obtained.

REFERENCES:
patent: 3644731 (1972-02-01), Eloy
patent: 4318029 (1982-03-01), Jergenson
patent: 4318030 (1982-03-01), Jergenson
patent: 4328667 (1982-05-01), Valentian et al.

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