Radiant energy – Ionic separation or analysis – Cyclically varying ion selecting field means
Patent
1996-03-29
1997-12-30
Berman, Jack I.
Radiant energy
Ionic separation or analysis
Cyclically varying ion selecting field means
250288, 250427, H01J 4942, H01J 4914
Patent
active
RE0357014
ABSTRACT:
A quadrupole mass spectrometer includes means for measuring total ion current having an electron repeller cage disposed about an electron source filament. The electron repeller cage repels electrons emitted by the electron source filament, urging them away from both the repeller and the filament, while also attracting positive ions. When the positive ions contact the electron repeller cage, a current is induced that is measured at the electron repeller cage. The measured current represents total ion current transmitted through the spectrometer. Thus, the need to include a total pressure measurement plate to measure total ion current is eliminated, and since the ion-exposed surface area of the electron repeller cage is greater than the ion-exposed surface area of the total pressure measurement plate, the invention provides improved total pressure measurement sensitivity.
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Berman Jack I.
MKS Instruments Inc.
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