Electron reversal ionizer for detection of trace species using a

Details Electron reversal ionizer for detection of trace species using a Electron reversal ionizer for detection of trace species using a

1993-09-15

1994-12-20

Anderson, Bruce C.

Radiant energy

Ion generation

Electron bombardment type

250288, H01J 3708, H01J 4900, B01D 5944

Patent

active

053748280

ABSTRACT:
A reversal electron, high-current ionizer capable of focusing a beam of electrons to a reversal region employs an indirectly heated cathode having a concave emitting surface of width W<2r, where r is the radius of curvature and preferably a ratio of width to radius approximately equal to one for optimum high current for a given cathode width.

REFERENCES:
patent: 4023061 (1978-05-01), Berwick et al.
patent: 4593230 (1986-06-01), True
patent: 4649278 (1987-03-01), Chutjian et al.
patent: 4739214 (1988-04-01), Barr
patent: 4782235 (1988-11-01), Lejeune
patent: 4933551 (1990-06-01), Bernius et al.
patent: 5256874 (1993-10-01), Chutjian
S. Bounsellek, S. H. Alajajian and A. Chutjian, "Negative-Ion Formation in the Explosives RDX, PETN, and TNT Using the Reversal Electron Attachment Detection Technique", Am. Soc. for Mass Spectrometry 1992, 3, pp. 243-247.

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