Mass spectrometer

Details Mass spectrometer Mass spectrometer

H - Electricity

01

J

H01J 49/10 (2006.01) G01N 27/62 (2006.01) G01N 30/72 (2006.01) H01J 49/00 (2006.01) H01J 49/04 (2006.01) H01J 49/14 (2006.01) H01J 49/26 (2006.01)

Patent

CA 2474836

An Atmospheric Pressure Chemical Ionisation ("APCI") ion source is disclosed comprising a housing 14 having a corona discharge chamber 1, a reaction chamber 2 and a passage 6 connecting the corona discharge chamber 1 to the reaction chamber 2. Reagent ions are formed in the corona discharge chamber 1 and pass to the reaction chamber 2 via the passage 6. Analyte is sprayed into a heated tube 3. Low to moderately polar analyte molecules pass from the heated tube 3 into the reaction chamber 2 whereupon the analyte molecules are ionised by interacting with reagent ions. In contrast, highly polar analytes are ionised by thermal ionisation processes within the heated tube 3 and hence highly polar analyte ions pass into the reaction chamber 2. Analyte ions entering the reaction chamber 2 are substantially shielded from the effects of an electric field generated in the corona discharge chamber 1 as part of the process of generating reagent ions. The APCI ion source according to the preferred embodiment is able to optimally ionise a sample containing both low to moderately polar analytes and also highly polar analytes.

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