Variation of relative ion abundances with accelerator potential in the mass spectrometer: The importance of source penetration

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Abstract
Calculations have been carried out, using the Quasi‐Equilibrium Theory of Mass Spectra to show that a decrease in penetration of the accelerating field intol the ion source of a mass spectrometer may significantly increase the number of primary daughter ions [A]+ produced from a molecular ion [M]+ in the source. The calculations show that this effect appears to be more important than the decay of [M]+ between source and collector in implementing an increase in [A]+/[M]+ at the collector with decreasing accelerator potential.