Ion mobility spectrometer

Radiant energy – Ionic separation or analysis – Ion beam pulsing means with detector synchronizing means

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H01J 4900

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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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