Gridded electron reversal ionizer

Details Gridded electron reversal ionizer Gridded electron reversal ionizer

1992-03-25

1993-10-26

Berman, Jack I.

Radiant energy

Ionic separation or analysis

With sample supply means

250286, 31511191, H01J 4904

Patent

active

052568741

ABSTRACT:
A gridded electron reversal ionizer forms a three dimensional cloud of zero or near-zero energy electrons in a cavity within a filament structure surrounding a central electrode having holes through which the sample gas, at reduced pressure, enters an elongated reversal volume. The resultant negative ion stream is applied to a mass analyzer. The reduced electron and ion space-charge limitations of this configuration enhances detection sensitivity for material to be detected by electron attachment, such as narcotic and explosive vapors. Positive ions may be generated by generating electrons having a higher energy, sufficient to ionize the target gas and pulsing the grid negative to stop the electron flow and pulsing the extraction aperture positive to draw out the positive ions.

REFERENCES:
patent: 4755669 (1988-07-01), Grant et al.
patent: 4782235 (1988-11-01), Lejeune et al.
patent: 4808820 (1989-02-01), Blau
patent: 4810878 (1989-03-01), Kobayashi
patent: 4933551 (1990-06-01), Bernius et al.

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