Mass spectrometer for positive and negative ions

Details Mass spectrometer for positive and negative ions Mass spectrometer for positive and negative ions

1988-03-04

1989-03-07

Anderson, Bruce C.

Radiant energy

Ionic separation or analysis

250283, 250299, 250397, H01J 4906

Patent

active

048108820

ABSTRACT:
The invention provides a mass spectrometer capable of detecting both positive and negative ions. Positive ions emerging from the mass analyzer strike a conversion electrode to release secondary electrons which pass through an annular electrode to strike a phosphor, releasing photons. Negative ions strike the surface of the annular electrode to release secondary electrons which also strike the phosphor, releasing photons. The photons are detected with a conventional photomultiplier. The electrodes are biased and disposed so that both positive ions and negative ions may be detected without changing the potentials applied to them.

REFERENCES:
patent: 3898456 (1975-08-01), Dietz
patent: 4136280 (1979-01-01), Hunt et al.
patent: 4267448 (1981-05-01), Feser et al.
patent: 4423324 (1983-12-01), Stafford

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