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A multi-sector tandem mass spectrometer fitted with a radiofrequency (rf)-only quadrupole collision cell (Qcell) has allowed fast and unambiguous identification of dehydroanilinium ions, the distonic isomers of ionized aniline. These ions were prepared by collisional deiodonation of protonated iodoanilines previously generated by chemical ionization (CI) or even better by liquid secondary ion mass...
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