Thermal electron source

Details Thermal electron source Thermal electron source

1986-03-07

1988-03-22

Anderson, Bruce C.

Radiant energy

Ion generation

Field ionization type

250427, 250379, 250382, H01J 2720

Patent

active

047330864

ABSTRACT:
A thermal electron source suitable for use in an electron capture detector comprises a source of stable ultra-violet light, an ultra-violet transparent support member (20,31) located in the path of the ultra-violet light (41) and a thin photo-emissive metallic layer (1A, 24, 33) coated over the surface of the support member remote from the source. In one form the source is a cylindrical mercury vapor lamp (1) with the photo-emissive layer coated directly on the lamp. The coated lamp may then be enclosed within a cylindrical anode (8) with a gas flow between them and the electrical current is measured between the anode and cathode. In an alternative arrangement a planar geometrical assembly is provided. Preferably the photo-emissive material is gold and the carrier gas is an argon-methane mixture.

REFERENCES:
patent: 2959677 (1960-11-01), Robinson et al.
patent: 3277296 (1966-10-01), Dimick et al.
patent: 3313971 (1967-04-01), Negy
patent: 3619682 (1971-11-01), Newton et al.
patent: 3665235 (1972-05-01), Hugot
patent: 4063156 (1977-12-01), Patterson
patent: 4264817 (1981-04-01), Newkermans et al.
patent: 4476392 (1984-10-01), Young

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