The method of ionization of mass spectrometry which results in well-established diagnostic fragmentation patterns that are useful in the identification of compounds of unknown structure is called:

The method of ionization of mass spectrometry which results in well-established diagnostic fragmentation patterns that are useful in the identification of compounds of unknown structure is called:
A . atmospheric pressure chemical ionization (APCI)
B . chemical ionization (CI)
C . electron impact (EI) ionization
D . electrospray ionization (ESI)
E . fast atom bombardment (FA
F . ionization
G . Pharmacy Practice

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Answer: C