Radiant energy – Ionic separation or analysis – Ion beam pulsing means with detector synchronizing means
Patent
1983-09-23
1985-11-05
Anderson, Bruce C.
Radiant energy
Ionic separation or analysis
Ion beam pulsing means with detector synchronizing means
250282, 422 98, B01D 5944, G01N 2766
Patent
active
045516243
ABSTRACT:
An ion mobility spectrometer system with improved specificity. The ion mobility spectrometer has a reaction chamber and a drift chamber, an ionization source disposed in the reaction chamber, an injection grid separating said reaction and drift chambers, a collector electrode disposed in the drift chamber and a sample input injecting the sample and carrier into the reaction chamber.
A source injects acetone and/or carbon tetrachloride as reagents into the carrier gas prior to entering the sample input. The acetone reactant forms a dimer ion in the positive ion spectrum which impedes the clustering of water and provides a narrow fixed peak in the ion spectrum which serves as a reference point in the ion spectrum for the algorithm used in the electronic control unit generating an output characteristic of the sample. The carbon tetrachloride reactant forms a (H.sub.2 O).sub.n Cl.sup.- ion which provides a reference in the negative ion spectrum for the algorithm used in the electronic control unit. The acetone and carbon tetrachloride reactants both rendering the ion mobility spectrometer more specific for detection and identification.
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Cox John N.
Spangler Glenn E.
Allied Corporation
Anderson Bruce C.
Guss Paul A.
Ignatowski James R.
Wells Russel C.
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