Radiant energy – Ion generation – Field ionization type
Patent
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.
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Anderson Bruce C.
Guss Paul A.
The Secretary of State for Defence in Her Britannic Majesty's Go
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