Flow discharge ion source

Details Flow discharge ion source Flow discharge ion source

1980-06-04

1982-03-23

Anderson, Bruce C.

Radiant energy

Ionic separation or analysis

With sample supply means

250281, 250423R, B01D 5944

Patent

active

043214673

ABSTRACT:
A flowing discharge ion source for supplying negative and positive ions to a mass spectrometer has an elongated, confined flow and discharge region through which flow the sample to be analyzed and a reagent gas and in which ionizing discharge electrodes are located. Inlet and outlet gas flow orifices are independently variable so that the reagent gas pressure in the discharge region and flow velocity therethrough are controlled. Controlling flow velocity provides one way for determining reagent and sample gas residence time, which is further controlled by making the position of the discharge electrodes adjustable along the length of the ionization region. A controllable heater is provided upstream of the discharge region to regulate reagent and sample gas temperature.

REFERENCES:
patent: 3555272 (1971-01-01), Munson et al.
patent: 3590243 (1971-06-01), Perrin
patent: 3944826 (1976-03-01), Gray
patent: 4122343 (1978-10-01), Risby et al.
patent: 4239967 (1980-12-01), Carr et al.
Biospect.TM., The Chemical Ionization Mass Spectrometer (Scientific Research Instruments, Baltimore, MD, 1973).

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