Discharge ionization mass spectrometer

Details Discharge ionization mass spectrometer Discharge ionization mass spectrometer

H - Electricity

01

J

358/9

H01J 49/04 (2006.01) G01N 30/72 (2006.01) H01J 49/12 (2006.01)

Patent

CA 1269180

ABSTRACT DISCHARGE IONIZATION MASS SPECTROMETER The invention provides a mass spectrometer (10) for the analysis of a sample dissolved in a fluid, and in particular a spectrometer for the analysis of high molecular weight compounds in the eluent of a liquid chromatograph. The fluid to be analyzed is at least partly vaporized and sprayed into the cathode dark space (45) of a glow discharge (46). Ions characteristic of the sample are extracted from the discharge and subsequently mass analyzed. Conveniently, spraying into the cathode dark space (45) is achieved by making the cathode electrode of the discharge comprise the spraying means (38) through which the fluid is sprayed. Little fragmentation of the high mass ions is caused by the process, and the invention extends the range of compounds which can be analyzed in comparison with similar prior art thermospray type mass spectrometers.

541776

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