Abstract
The single-ion detection efficiency of two types of electron multipliers is provided for incident energies reaching 10 keV. Absolute efficiencies above 90% were measured for a discrete dynode electron multiplier (DDEM), in response to Ar + ions and protons, above an energy of 5 keV. The efficiency to detect protons is consistently higher than that of Ar + ions, due to a higher secondary electron emission yield. For a channel electron multiplier we have measured a similar maximal detection efficiency for Ar + ions; though strongly varying across the detector surface.
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