Photoionization ion mobility spectrometer

Details Photoionization ion mobility spectrometer Photoionization ion mobility spectrometer

H - Electricity

01

J

H01J 49/00 (2006.01) G01N 27/64 (2006.01)

Patent

CA 2112367

An improved photoionization ion mobility spectrometer is disclosed which utilizes a flashlamp (12) as the source for ioni- zation. A gas sample is introduced via a carrier gas into an ionization chamber (30) which is part of the spectrometer cell. Ioniz- able molecules contained in the injected gas sample are ionized by the ultraviolet light emitted from the flashlamp. The ionized molecules are attracted by an electrostatic drift field into a drift chamber (20) and travel therethrough against the flow of a drift gas counter-current thereto until they are captured by a collector located in the drift chamber opposite to the ionization chamber. A dopant with an effective ionization potential lower than the photon energy of the emitted light can be introduced into the ioni- zation chamber to further improve the sensitivity and specificity.

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