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Positive Ion Counting for Mass Spectrometer Beam Currents of 1014 to 1019 Ampere
Volume 8, Number 1 (Feb. 1954) Page 17-23
White, F.A.; Collins, T.L.
A reliable method for detecting and recording very small ion beam currents is described. A twenty-stage electron multiplier is used in conjunction with scalers and other circuitry for counting individual positive ions. Advantages and limitations of this method, as applied to mass spectrometer problems, are discussed.