Radiant energy – Ionic separation or analysis
Patent
1996-12-05
1999-02-02
Anderson, Bruce
Radiant energy
Ionic separation or analysis
250283, 313103CM, B01D 5944, H01J 4900
Patent
active
058669019
ABSTRACT:
Ions in a chamber or space are detected using an electron multiplier operating at relatively low gain. The electron multiplier is placed in communication with the chamber, such as a chamber of a mass spectrometer, such that ions from the chamber enter the electron multiplier. A bias voltage applied to the multiplier sets the gain of the multiplier. By setting the gain at a relatively low value, the gain of the multiplier remains independent of chamber pressure, such that an accurate pressure measurement is obtained without calibration at a particular pressure or as a function of pressure.
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Dietz, L. A. et al. "Electron multiplier-scintillator detector for pulse counting positive or negative ions" Rev. Sol. Instrum., vol. 49, No. 8, Sep. 1978.
Laprade B. N. et al. "The Operation of Single Channel Electron Multipliers in Extreme Environments" Mass Spec. Source, vol. XIV, No. 3, 1991.
McAllister C. Bruce
Penn Stephen M.
Anderson Bruce
MKS Instruments Inc.
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