Atmospheric sampling glow discharge ionization source

Details Atmospheric sampling glow discharge ionization source Atmospheric sampling glow discharge ionization source

G - Physics

01

N

358/9

G01N 27/64 (2006.01) G01N 27/68 (2006.01) H01J 49/12 (2006.01)

Patent

CA 1286426

ATMOSPHERIC SAMPLING GLOW DISCHARGE IONIZATION SOURCE ABSTRACT OF THE DISCLOSURE An atmospheric sampling glow discharge ionization source that can be used in combination with an analytical instrument which operates at high vacuum, such as a mass spectrometer. The atmospheric sampling glow discharge ionization source comprises a chamber with at least one pair of electrodes disposed therein, an inlet for a gaseous sample to be analyzed and an outlet communicating with an analyzer which operates at subatmospheric pressure. The ionization chamber is maintained at a pressure below atmospheric pressure, and a voltage difference is applied across the electrodes to induce a glow discharge between the electrodes, so that molecules passing through the inlet are ionized by the glow discharge and directed into the. analyzer. The ionization source accepts the sample under atmospheric pressure conditions and processes it directly into the high vacuum instrument, bridging the pressure gap and drawing off unwanted atmospheric gases. The invention also includes a method for analyzing a gaseous sample using the glow discharge ionization source described above.

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