Abstract
An angle-resolving slit installed in a conventional double focussing mass spectrometer allows spectra with unique information content to be generated. The system performance is discussed and several types of spectra are displayed. In particular, energy loss spectra and mass spectra of ions which survive strong collisions are recorded. These latter species are typically the lower-mass even-electron ions which are least susceptible to charge exchange, which appears to be the major ion-removal process in these experiments. Collision-induced dissociation at non-zero scattering angles transfers internal energies which increase with the scattering angle. This is demonstrated by the increased relative abundances of ions formed by multistep versus one-step fragmentation sequences. The methods developed provide new insights into ion structure as well as thermochemistry, and it is shown that the C 7H → 7 ion formed from benzyl chloride can be distinguished from that generated from toluene.
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