Mass spectrometer

Details Mass spectrometer Mass spectrometer

1989-06-01

1991-02-26

Berman, Jack I.

Radiant energy

Ionic separation or analysis

250283, 250299, 250397, H01J 4406

Patent

active

049964224

ABSTRACT:
A mass spectrometer, including an evacuable vessle, mass separation means provided in the evacuable vessel for separating ions in accordance with the mass thereof, and ion detection means provided in the evacuable vessel for detecting ions emitted from the mass separation means to convert the emitted ions into an electric signal, in which the ion detection means includes an electron-multiplier for detecting positive ions and a photo-multiplier for detecting negative ions. According to this mass spectrometer, positive ions can be detected at high sensitivity, and negative ions are readily detected.

REFERENCES:
patent: 3898456 (1975-08-01), Dietz
patent: 4136280 (1979-01-01), Hunt et al.
patent: 4423324 (1983-12-01), Stafford
patent: 4507555 (1985-03-01), Chang
patent: 4755669 (1988-07-01), Grant et al.
patent: 4810l882 (1989-03-01), Bateman
Rev. Sci Instrum., vol 44, No. 4, Sep. 1978, pp. 1250-1256, American Institute of Physics; L. A. Diert et al: "Electron Multiplier-Scintillator Detector for Pulse Counting Positive or Negative Ion".
International Journal of Mode Spectrometry and Ion Physics, vol. 10, 1972-1973, pp. 85-105, Elsevier Publishing Co., "Field Ionization Mass Spectrometry using a Scintilation Detector".
J. of Mass Spectrometry and Ion Physics, vol. 33, No. 1, Feb. 1980, pp. 45-55, Elsevier Scientific Publishing Co., Amsterdam, NL; D. L. Donohue et al., "An Electro-Optical Ion Detector for Spark Source Mass Spectrometry".

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