Mass spectrometer for positive and negative ions

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

H - Electricity

01

J

358/9

H01J 49/02 (2006.01) G01T 1/28 (2006.01) H01J 49/32 (2006.01)

Patent

CA 1269181

Abstract of the Disclosure 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.

560384

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