Combination of Chemcial Ionization (CI) and Low Energy Ionization (EI) Capabilities with High-Resolution Q-TOF GC/MS

Important applications for high-resolution gas chromatography mass spectrometer
(GC/MS) systems include untargeted screening approaches as well as unknown
compound identification. For many classes of compounds, low energy electron
ionization (EI) provides significant improvements in the relative abundance of
molecular ions compared to standard (70 eV) EI, and enables enhancement in
selectivity and compound identification capability without any down time due to
changing the ion source or additional tuning. However, there is still an opportunity
for alternative ionization sources as a complimentary technique (that is, chemical
ionization), combined with high-resolution GC/MS, predominantly for selected
compounds of environmental significance. In this work, a comparison of low energy
EI and chemical ionization (CI) data acquired on the Agilent 7250 GC/Q-TOF will be

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