Mass spectrometer and method

Details Mass spectrometer and method Mass spectrometer and method

H - Electricity

01

J

358/9

H01J 49/38 (2006.01)

Patent

CA 1226077

-16- MASS SPECTROMETER AND METHOD ABSTRACT OF THE DISCLOSURE A mass spectrometer including a vacuum chamber wherein molecular flow conditions are maintained. A sample introduced into the chamber is ionized while a magnetic field through the chamber induces ion cyclotron resonance. Trapping plates are provided for restricting ion movement along the magnetic field while a conductance limit plate divides the chamber into first and second compartments. The conductance limit plate has an orifice configured to allow ion equilibration between the compartments while maintaining a pressure differential between them. The conductance limit plate includes an electrode that is selectively connected to a means for applying trapping potential to selectively trap ions in one of said compartments.

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