Ion mobility spectrometer

Details Ion mobility spectrometer Ion mobility spectrometer

1997-07-09

1999-10-19

Nguyen, Kiet T.

Radiant energy

Ionic separation or analysis

Ion beam pulsing means with detector synchronizing means

H01J 4900

Patent

active

059693495

ABSTRACT:
Ion mobility spectrometer with a non-radioactive electron source to generate ions inside a reaction chamber. The reaction chamber consists of two partial chambers, one of which is evacuated and comprises the electron source, and the other one is connected to the drift chamber of the IMS via a shutter grid. The partition wall between both partial chambers is transparent to electrons but impermeable for gas molecules. The electron source may comprise a thermoemitter or a photocathode, which is illuminated from outside through a window. In this way, any contact between analyte and electron source is avoided, thereby improving the measuring stability and enabling operation in positive and negative mode.

REFERENCES:
patent: 5021654 (1991-06-01), Campbell et al.
patent: 5587581 (1996-12-01), Stroosnyder
P. Begley et al., Photoemissive ionization source for ion mobility detectors, Journal of Chromatography, vol. 588, pp. 239-249, 1991.

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