Ionization chamber with electron source

Details Ionization chamber with electron source Ionization chamber with electron source

H - Electricity

01

J

H01J 49/14 (2006.01) G01N 27/64 (2006.01) H01J 49/08 (2006.01) H01J 49/26 (2006.01)

Patent

CA 2313729

Ionization chamber, especially for an ion mobility spectrometer, with a non-radioactive electron source. The chamber consists of two compartments, of which one is evacuated and contains an electron source, and the other represents the reaction chamber of the IMS. In the evacuated compartment, X--ray quanta are produced in an anode by electron bombardment and these X-ray quanta can penetrate a partition between the two compartments. The partition between the two compartments is impermeable to electrons from the source and to gas molecules. In one or several conversion layers within the reaction compartment, X-ray quanta are converted to quanta of a lower energy and/or photoelectrons that can ionize the air constituents at a high level of efficiency.

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