Characterization of ion-dipole complexes by collisional activation and collisional ionization spectrometry

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Complexes between a radical cation and a dipole molecule are taking their place beside the conventional isomeric ion structures in mass spectra. Complexes of H 2O, NH 3, H 2S, PH 3, HF, HCl, HBr, CH 3CN and CH 3NC with CH 2 + ions and a number of higher homologues are formed via dissociative ionization and/or ion molecule reactions. Structures were established by Collisional Ionization and Activation Mass spectra. A number of stabilities established by measurements and quantum mechanical calculations show that they fall in the range of those of conventional isomers and that conversion barriers are generally high.