Radiant energy – Ionic separation or analysis – With sample supply means
Patent
1993-10-07
1995-05-02
Anderson, Bruce C.
Radiant energy
Ionic separation or analysis
With sample supply means
250292, 250282, B01D 5944, H01J 4900
Patent
active
054122074
ABSTRACT:
A method and gas analysis system for a mass spectrometer including an ion pump for creating an internal vacuum within said mass spectrometer, an ionization chamber, an inlet passage through which a gas sample is introduced into the ionization chamber, valve means associated with the inlet passage for controlling the volume of gas sample introduced into the ionization chamber, a filament for introducing electrons into the ionization chamber whereby the electrons bombard the gas sample thus forming ions, an extractor plate positioned adjacent the ionization chamber and biased such that a proportion of ions and electrons are allowed to pass through the extractor plate, a quadrupole filter into which the ions and electrons are directed by the extractor plate, the quadrupole filter operative to permit a stream of ions with a pre-selected mass-to-charge ratio to pass through the filter and ions other than those having the pre-selected mass-to-charge ratio being separated from the stream of ions, means for directing electrons toward ions other than those having the pre-selected mass-to-charge ratio in the area of said quadrupole filter so that the electrons combine with the ions, a sensor for detecting the stream of ions passing through the quadrupole filter, and analyzing means connected with the sensor for analyzing the components of the gas sample.
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Baer Norman W.
Ellis Donald G.
Micco Alexander J.
Anderson Bruce C.
Marquette Electronics, Inc.
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