Accurate mass measurement of lube oil by GC/FI-TOFMS
MSTips No. 058
FD (Field Desorption) and FI (Field Ionization) are ionization techniques based on the tunneling effect that is induced in high electric potential fields. When a sample is applied on the emitter in advance, it is called FD. On the other hand, it is called FI when a vaporized sample is introduced to the emitter. FD and FI produces molecular ions easily and very few fragment ions. For this reason, FI is a very useful ionization method for samples which hardly produce molecular ions by EI (Electron Ionization), such as oil. This application note shows the result of a commercial lube oil by GC/FI and the elemental composition determination by FI.