✍ Scribed by H. I. Kenttämaa; K. V. Wood; K. L. Busch; R. G. Cooks
No coin nor oath required. For personal study only.
Charge exchange reactions within a triple quadrupole mass spectrometer characterize doubly charged ions formed in the ion source. Two methods have been developed for identifying the singly charged ions formed from doubly charged ions by charge exchange in the collision quadrupole. The 6rst is based on the characterktiadly high kinetic energy-to-charge ratios of the products of charge exchange; this property can be used to separate these ions from all other singly charged ions. This retarding potential method is analogous to procedures for recording doubly charged ion lllftss spectra using sectornts. The second method is based on the fact that, although mass remains constant in the charge exchange reaction, the change in mass-to-charge ratio can be followed. A charge exchange linked scan, predicated on changes in charge rather than mass, but otherwise analogous to n e d loss/gain scans, is descrii. Information on the structure of doubly charged ions can be obtained by recording the fragmentation products of dissociative charge exchange. The utility of the charge exchange l i e d scan for the selective identification of polynuclear aromatic compoumki in a complex mixture is descrii. The methods given can be generalized to cover other charge permutation reactions.
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