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Increased Electron Multiplier Lifetimes Through Intelligent Data Acquisition

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Increased Electron Multiplier Lifetimes Through Intelligent Data Acquisition

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The electron multiplier (EM) is an extremely sensitive RGA detector. It allows the measurement of partial pressures as low as 10-14 Torr through the action of ionized residual gas molecules impacting an active film on the EM detector surface. This impact releases free electrons that cascade through the detector channels with each surface impact creating more free electrons. This magnifies the original ion signal by factors of hundreds or even thousands. The active film in an EM degrades over time. The lifetime depends upon various factors, especially on vacuum quality and the impact of ion concentrations at or above the operational limit of the detector.

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