Abstract
The factors that influence the sensitivity and detection limits under electron ionization (EI) and chemical ionization (CI) conditions in an ion trap mass spectrometer have been examined. It was found that for benzophenone, EI had a three times lower detection limit than CI, and EI was approximately three times more sensitive for the detection of the molecular species. When sensitivities were compared on the basis of total ion current detected, using equal duty cycles, EI was observed to be fifteen times more sensitive than CI. Selected reagent ion CI is shown, by defining the kinetic as well as thermodynamic aspects of the ion/molecule reactions in the ion trap, to be particularly useful in sensitivity studies and should be exploited for certain analyses.
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