High-efficiency electron ionizer for a mass spectrometer array

Details High-efficiency electron ionizer for a mass spectrometer array High-efficiency electron ionizer for a mass spectrometer array

1998-10-01

2000-06-06

Nguyen, Kiet T.

Radiant energy

Ion generation

Electron bombardment type

250423R, 250288, H01J 4914

Patent

active

060721820

ABSTRACT:
The present invention provides an improved electron ionizer for use in a quadrupole mass spectrometer. The improved electron ionizer includes a repeller plate that ejects sample atoms or molecules, an ionizer chamber, a cathode that emits an electron beam into the ionizer chamber, an exit opening for excess electrons to escape, at least one shim plate to collimate said electron beam, extraction apertures, and a plurality of lens elements for focusing the extracted ions onto entrance apertures.

REFERENCES:
patent: 4943718 (1990-07-01), Haines et al.

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