Abstract
The fragmentations on electron-impact of two piperazinodibenza- zepine drugs with CNS activity are investigated by high and low resolution mass spectrometry, direct analysis of daughter ions (DADI) and defocussing metastable techniques, as well as deuterium labelling. Proposed ion structures are given and some characteristic spectral differences induced by the differences in chemical structure are discussed. The finding that an electrostatic analyser voltage scan of a “reversed” geometry mass spectrometer can also result in the detection of 1st field free region transitions, which has not previously been described, is explained and illustrated.
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