Fig. 7
From: A European proposal for quality control and quality assurance of tandem mass spectral libraries
The influence of the “1/3 rule” for ion trap spectra, exemplified with desipramine using a spectrum acquired on a LIT-Orbitrap instrument with CID and a QqTOF spectrum taken from the WRTMD. The black dot indicates the precursor mass isolated for MS/MS fragmentation (hollow dot). Due to the “low mass cut-off” observed on LIT-Orbitrap instruments, an abundant fragment ion is missing in the corresponding fragment ion mass spectrum