Mass spectrometer having an ICP source

Details Mass spectrometer having an ICP source Mass spectrometer having an ICP source

1994-09-30

1996-09-03

Berman, Jack I.

Radiant energy

Ionic separation or analysis

250282, 250295, 250296, H01J 4910

Patent

active

055525997

ABSTRACT:
A mass spectrometer includes an inductive coupled plasma source whose flame is near ground potential, an interface, a flight tube, and an analyzer that includes magnetic and electric sectors, and an ion detector, which detector is operated at high voltage for ion acceleration. The magnetic sector includes a magnet and pole pieces that are insulated electrically relative to the flight tube. The pressure within the interface preferably does not exceed 10.sup.-3 mbar. By varying the magnetic field and the acceleration potential, identification of a specified mass over defined time intervals is carried out. The disclosed mass spectrometer provides improved coupling between the plasma ion source and a double-focussing analyzer, while advantageously providing a low voltage regime for the plasma source.

REFERENCES:
patent: 4472631 (1984-09-01), Enke et al.
patent: 4804838 (1989-02-01), Miseki
patent: 5218204 (1993-06-01), Honk et al.
patent: 5352893 (1994-10-01), Freedman
Article entitled "The Ion Mass Spectrometer on Giotto", by H. Balsiger et al, J. Phys. E:Sci. Instrum. 20, 1987 S.759-767.

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