Basic Properties of Electron Multiplier Ion Detection and Pulse Counting Methods in Mass Spectrometry
作者： Leonard A. Dietz
DOI: 10.1063/1.1719460
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摘要: The critical role played by first stage gain in shaping the output pulse height distribution and detection efficiency of an electron multiplier used as ion detector is studied theoretically experimentally. In a well‐focused it found that anode distributions observed for different species agree well with calculated using compound Poisson statistics. Models are developed to explain measurement bias which either dc or counting modes shown how these results can be applied isotope ratio measurements. Design operating characteristics described 20 was high speed efficiency. surface dynode coated thin film Al2O3 provide stable yield 7–9 secondary electrons/incident monatomic alkali ions kV impact energy. polyatomic Na2BO2+ yie...
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