Abstract
The observed fragmentations in collisionally activated dissociation (CAD) spectra of CX+ adduct ions formed in the fast atom bombardment (FAB) mass spectra of C 2+ 2X - bisammonium salts are the same as those previously put forward to account for the FAB mass spectra of these compounds. Thus, substitution and elimination reactions occur in the gaseous phase between X - anions and C 2+ cations, this being a new example of chemical reactivity in the gaseous phase in mass spectrometry. Furthermore, it was established that charge-remote fragmentations of these C 2+ 2X - salts observed by mass spectrometry provide ions which allow aliphatic chain identification. These ions are as abundant in the FAB mass spectra as in the CAD spectra.
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